USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 1 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

2017

Baffaut, C., Nelson, N.O., Lory, J.A., Senaviratne, G., Bhandari, A.B., Udawatta, R.P., Sweeney, D.W., Helmers, M.J., Van Liew, M.W., Mallarino, A.P., Wortmann, C.S. 2017. Multisite evaluation of APEX for water quality: I. Best professional judgement parameterization. Journal of Environmental Quality. 46(6):1323-1331. Cho, Y., Sudduth, K.A., Chung, S. 2016. Soil physical property estimation from soil strength and apparent electrical conductivity sensor data. Biosystems Engineering. 152:68-78. Cho, Y., Sudduth, K.A., Drummond, S.T. 2017. Profile soil property estimation using a VIS-NIR-EC-force probe. Transactions of the ASABE. 60(3):683-692. Clark, K., Boardman, D.L., Staples, J.S., Easterby, S., Reinbott, T.M., Kremer, R.J., Kitchen, N.R., Veum, K.S. 2017. Crop yield and soil organic carbon in conventional and no-till organic systems on a claypan soil. Agronomy Journal. 109(2):588-599. Conway, L.S., Yost, M.A., Kitchen, N.R., Sudduth, K.A., Thompson, A.L., Massey, R.E. Topsoil thickness effects on corn, soybean, and switchgrass production on claypan soils. Agronomy Journal. 109(3):782-794. Karlen, D.L., Goeser, N., Veum, K.S., Yost, M.A. 2017. On-farm soil health evaluations: Challenges and opportunities. Journal of Soil and Water Conservation Society. 72(2):26A-31A. Kitchen, N.R., Shanahan, J.F., Ransom, C.J., Bandura, C.J., Bean, G.M., Camberato, J.J., Carter, P.R., Clark, J.D., Ferguson, R.B., Fernández, F.G., Franzen, D.W., Laboski, C.A.M., Nafziger, E.D., Qing, Z., Sawyer, J.E., and Shafer, M. 2017. A public-industry partnership for enhancing corn nitrogen research and datasets: Project description, methodology, and outcomes. Agron. J. 109(5):2371–2389. Lerch, R.N., Lin, C.H., Goyne, K.W., Kremer, R.J., Anderson, S.H. 2017. Vegetative buffer strips for reducing herbicide transport in runoff: effects of buffer width, vegetation, and season. Journal of the American Water Resources Association. 53(3):667-683. Nelson, N.O., Baffaut, C., Lory, J.A., Senaviratne, G., Bhandari, A.B., Udawatta, R.P., Sweeney, D.W., Helmers, M.J., Van Liew, M.W., Mallarino, A.P., Wortmann, C.S. 2017. Multisite evaluation of APEX for water quality: II. Regional parameterization. Journal of Environmental Quality. 46(6):1349-1356. Pan, X., Richardson, M.D., Deng, S., Kremer, R.J., English, J.T., Mihail, J.T., Sams, C.E., Scharf, P.C., Veum, K.S., Xiong, X. 2017. Effect of organic amendment and cultural practice on large patch occurrence and soil microbial community. Crop Science. 57:1-10. Sadler, E.J., Sudduth, K.A., Drummond, S.T., Thompson, A.L., Chen, J., Nash, P.R. 2016. Inferring random component distributions from environmental measurements for quality assurance. Agricultural and Forest Meteorology. 237:362-370. Salmeron, M., Purcell, L.C., Vories, E.D., Shannon, G. 2017. Simulation of genotype-by-environment interactions on irrigated soybean yields in the U.S. Midsouth. Agric. Systems 150(1):120–129. Sharpley, A.N., Kleinman, P.J., Baffaut, C., Beegle, D., Bolster, C.H., Collick, A., Easton, Z., Lory, J., Nelson, N., Osmond, D., Radcliffe, D., Veith, T.L., Weld, J. 2017. Evaluation of the phosphorus site assessment tools: lessons from the USA. Journal of Environmental Quality. Stevens, W.E., Rhine, M.D., Vories, E.D. 2017. Effect of irrigation and silicon fertilizer on total rice grain arsenic content and yield. Trade Journal Publication. 3:1-6. Veum, K.S., Sudduth, K.A., Kremer, R.J., Kitchen, N.R. 2017. Sensor data fusion for soil health assessment. Geoderma. 305:53-61.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 2 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Yost, M.A., Kitchen, N.R., Sudduth, K.A., Sadler, E.J., Drummond, S.T., and. Volkmann, M.R. 2017. Long-term impact of a precision agriculture system on grain crop production. Prec. Agric. 18(5):823-842. Yost, M.A., Kitchen, N.R., Sudduth, K.A., Thompson, A.L., Allphin, E. 2017. Topsoil thickness and harvest management influence switchgrass production and profitability. Agronomy Journal. 109(3):985-994. Yost, M.A., Kitchen, N.R., Sudduth, K.A., Thompson, A.L., Allphin, E. 2017. Topsoil thickness influences nitrogen management of switchgrass. BioEnergy Research. 10(2):265-477. Yost, M.A., Randall, B.K., Kitchen, N.R., Heaton, E.A. 2017. Yield potential and nitrogen requirements of Miscanthus × giganteus on eroded soils. Agronomy Journal. 109(2):684-695. Vories, E.D., Stevens, W.G., Rhine, M., and Straatmann, Z. 2017. Investigating irrigation scheduling for rice using variable rate irrigation. Agric. Water Management. 179(1):314-323. Zaibon, S., Anderson, S.H., Thompson, A.L., Kitchen, N.R., Gantzer, C.J., Haruna, S.I. 2017. Soil water infiltration affected by topsoil thickness in row crop and switchgrass production systems. Geoderma. 289:46-53.

2016

Baffaut, C., Dabney, S.M., Smolen, M., Yousef, M.A., Bonta, J.V., Chu, M.L., Guzman, J.A., Shedekar, V.S., Jha, M.K., Arnold, J.G. 2016. Hydrologic and water quality modeling: spatial and temporal considerations. Transactions of the ASABE. 58(6):1661-1680. Bobryk, C.W., Myers, D.B., Kitchen, N.R., Shanahan, J., Sudduth, K.A., Drummond, S.T., Gunzenhauser, B., Gomez Raboteaux, N.N. 2016. Validating a digital soil map with corn yield data for precision agriculture decision support. Agronomy Journal. 108:(3)957-965. Chan, R., Baffaut, C., Thompson, A., Sadler, E.J. 2016. Validating the soil vulnerability index for a claypan watershed. Catena. 148(2):185-194. Cho, Y., Sudduth, K.A., Chung, S.O. Soil physical property estimation from soil strength and apparent electrical conductivity sensor data. Biosystems Engineering. 152: 68-78. 2016. Franzen, D.W., Kitchen, N.R., Schepers, J.A., Holland, K.H., Raun, W.R. 2016. Algorithms for in-season nutrient management in cereals. Agronomy Journal. 108(5):1775-1781. Henry, C.G., Hirsh, S.L., Anders, M.M., Vories, E.D., Reba, M.L., Watkins, K.B., Hardke, J.T. 2016. Annual irrigation water use for Arkansas rice production. Journal of Irrigation and Drainage Engineering. Hu, G., Sudduth, K.A., He, D., Myers, D.B., Nathan, M.V. 2016. Soil phosphorus and potassium estimation by reflectance spectroscopy. Transactions of the ASABE. 59(1):97-105. Jaisi, D., H. Li, A. Wallace, P. Paudel, A. Balakrishna, R. N. Lerch. 2016. Mechanisms of bond cleavage during manganese oxide and UV degradation of glyphosate: Results from phosphate oxygen isotopes and molecular simulations. J Agric. Food Chem. 64(45):8474-8482. La, W., Sudduth, K.A., Kim, H., Chung, S. 2016. Fusion of spectral and electrochemical sensor data for estimating soil macronutrients. Transactions of the ASABE. 59(4):787-794. Malone, R.W., Yagow, G., Baffaut, C., Gitau, M., Qi, Z., Amatya, D., Parajuli, P., Bonta, J.V., Green, T.R. 2015. Parameterization guidelines and considerations for hydrologic models. Transactions of the ASABE. 58(6):1681-1703. Nordenholt, R.M., Goyne, K.W., Kremer, R.J., Lin, C.H., Lerch, R.N., Veum, K.S. 2016. Veterinary antibiotic effects on atrazine degradation and soil microorganisms. Journal of Environmental Quality. 45(2):565-575.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 3 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Randall, B.K., Yost, M.A., Kitchen, N.R., Heaton, E.A., Stelzer, H.E., Thompson, A.L. 2016. Impact of rhizome quality on miscanthus establishment in claypan soil landscapes. Industrial Crops and Products. 85(2016):331-340. Salmeron, M., Gbur, E.E., Bourland, F.M., Buehring, N.W., Earnest, L., Fritschi, F.B., Golden, B.R., Hathcoat, D., Lofton, J., McClure, A.T., Vories, E.D., et. al. 2016. Yield response to planting date among soybean maturity groups for irrigated production in the US Midsouth. Crop Science. 56:747-759. Stone, K.C., Sadler, E.J. 2016. Assessing spatial variation of corn response to irrigation using a bayesian semiparametric model. Transactions of the ASABE. 59(1):251-261. Syaharudin, Z., Anderson, S.H., Kitchen, N.R., Haruna, S. 2016. Hydraulic properties affected by topsoil thickness in switchgrass and corn-soybean cropping systems. Soil Science Society of America Journal. 80(5):1365–1376. Viscarra Rossel, R.A., Behrens, T., Ben-Dor, E., Brown, D.J., Dematte, J.A., Shepherd, K.D., Shi, Z., Stenberg, B., Stevens, A., Adamchuk, V., Sudduth, K.A. et al. 2016. A global spectral library to characterize the world's soil. Earth-Science Reviews. 155:198-230. Vories, E.D., Stevens, W., Rhine, M., Straatmann, Z. 2016. Investigating irrigation scheduling for rice using variable rate irrigation. Agricultural Water Management. 179:314-323. Weeks, W., Popp, M.P., Salmeron, M., Purcell, L., Gbur, E.E., Boruland, F.M., Buehring, N.W., Earnest, L., Fritschi, F.B., Golden, B.R., Vories, E.D., et. al. 2016. Diversifying soybean production risk using maturity group and planting date choices. Agronomy Journal. 108(5):1917-1929. Willett, C.D., Lerch, R.N., Lin, C., Goyne, K.W., Leigh, N.D., Roberts, C.A. 2016. Benzoxazinone-mediated triazine degradation: A proposed reaction mechanism. Journal of Agricultural and Food Chemistry. 64(24):4858-4865. Yost, M.A., Kitchen, N.R., Sudduth, K.A., Sadler, E.J., Baffaut, C., Volkmann, M.R., Drummond, S.T. 2016. Long-term impacts of cropping systems and landscape positions on claypan-soil grain crop production. Agronomy Journal. 108(2):713-725. Yost, M.A., Kitchen, N.R., Sudduth, K.A., Sadler, E.J., Drummond, S.T., Volkmann, M.R. 2016. Long-term impact of a precision agriculture system on grain crop production. Precision Agriculture. P. 1-20. Zaibon, S., Anderson, S.H., Thompson, A.L., Kitchen, N.R., Gantzer, C.J., Haruna, S.I. 2017. Soil water infiltration affected by topsoil thickness in row crop and switchgrass production systems. Geoderma. 289:46-53.

2015

Al-Qudah, O.M., Liu, F., Lerch, R.N., Kitchen, N.R., Yang, J. 2015. Controls on nitrate-N concentrations in groundwater in a Missouri claypan watershed. Earth and Space Science. 3(3):90-105. Baffaut, C., Ghidey, F., Sadler, E.J., Anderson, S.H. 2015. Long-term agroecosystem research in the central Mississippi River Basin: SWAT simulation of flow and water quality in the Goodwater Creek Experimental Watershed. J. Environ. Quality. 44:84-96. Baffaut, C., Sadler, E.J., Ghidey, F. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: Goodwater Creek Experimental Watershed flow data. J. Environ. Quality. 44:18-27. Jung, D., Kim, H., Choi, G., Ahn, T., Son, J., Sudduth, K.A. 2015. Automated lettuce nutrient solution management using an array of ion-selective electrodes. Transactions of the ASABE. 58(5):1309-1319. Kitchen, N.R., Blanchard, P.E., Lerch, R.N. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: hydrogeologic controls and crop management influence on nitrates in loess and fractured glacial till. J. Environ. Quality. 44:58-70.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 4 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Lerch, R.N., Baffaut, C., Kitchen, N.R., Sadler, E.J. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: dissolved nitrogen and phosphorus transport in a high-runoff-potential watershed. J. Environ. Quality. 44:44-57. Lerch, R.N., Baffaut, C., Sadler, E.J., Kremer, R.J. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: Goodwater Creek Experimental Watershed and regional herbicide water quality data. J. Environ. Quality. 44:28-36. Lerch, R.N., Kitchen, N.R., Baffaut, C., Vories, E.D. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: Goodwater Creek Experimental Watershed and regional nutrient water quality data. J. Environ. Quality. 44:37-43. Miller, B.V., Lerch, R.N., Groves, C.G., Polk, J.S. 2015. Recharge mixing in a complex distributary spring system in the Missouri Ozarks, USA. Hydrogeology J. 23:451-465. Moriasi, D.N., Zeckoski, R.W., Arnold, J.G., Baffaut, C., Malone, R.W., Daggupati, P., Guzman, J., Saraswat, D., Yuan, Y., Wilson, B.N., Shirmohammadi, A., Douglas-Mankin, K.R. 2015. Hydrologic and water quality models: Key calibration and validation topics. Transactions of the ASABE. 58(6):1609-1618. Sadler, E.J., Lerch, R.N., Kitchen, N.R., Anderson, S.H., Baffaut, C., Sudduth, K.A., Prato, A.A., Kremer, R.J., Vories, E.D., Myers, D.B., Broz, R., Miles, R.J., Young, J. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: introduction, establishment, and overview. J. Environ. Quality. 44:3-12. Sadler, E.J., Sudduth, K.A., Drummond, S.T., Vories, E.D., Guinan, P.E. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: Goodwater Creek Experimental Watershed weather data. J. Environ. Quality. 44:13-17. Sudduth, K.A., Jang, G., Lerch, R.N., Sadler, E.J. 2015. Long-term agroecosystem research in the Central Mississippi River Basin: hyperspectral remote sensing of reservoir water quality. J. Environ. Quality. 44:71-83. Thompson, L.J., Ferguson, R.B., Kitchen, N.R., Franzen, D.W., Mamo, M., Yang, H., Schepers, J.S. 2015. Model and sensor-based recommendation approaches for in-season nitrogen management in corn. Agronomy Journal. 107:2020–2030. Veum, K.S., Kremer, R.J., Sudduth, K.A., Kitchen, N.R., Lerch, R.N., Baffaut, C., Stott, D.E., Karlen, D.L., Sadler, E.J. 2015. Conservation effects on soil quality indicators in the Missouri Salt River Basin. J of Soil and Water Conservation. 70:232-246. Veum, K.S., Sudduth, K.A., Kremer, R.J., Kitchen, N.R. 2015. Estimating a soil quality index with VNIR reflectance spectroscopy. Soil Science Society of America J. 79:637-649. Vories, E.D., Stevens, G., Sudduth, K.A., Drummond, S.T., Benson, R. 2015. Impact of soil variability on irrigated and rainfed cotton. J of Cotton Science. 19(1):1-14.

2014

Banks, M.L., Kennedy, A.C., Kremer, R.J., Eivazi, F. 2014. Soil microbial community response to surfactants and herbicides in two soils. Applied Soil Ecology. Volume 74:12-20.

Baffaut, C., Sadler, E. J., Ghidey, F. 2014. A methodology to reduce uncertainties in the high-flow portion of a rating curve. Trans. ASABE. 57(3):803-813.

Chung, S., Sudduth, K.A., Drummond, S.T., Kitchen, N.R. 2014. Spatial variability of soil properties using nested variograms at multiple scales. J of Biosystems Engineering. 39(4):377-388.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 5 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Dolginow, J.P., Massey, R.E., Kitchen, N.R., Myers, D.B., Sudduth, K.A. 2014. A stochastic approach for predicting the profitability of bioenergy grasses. Agronomy Journal. 106(6):2137-2145. Garbrecht, J.D., Nearing, M.A., Douglas Shields, F., Tomer, M. D., Sadler, E. J., Bonta J. V., Baffaut, C. 2014. Impact of weather and climate scenarios on conservation assessment outcomes. J. Soil Water Conserv. 69(5):374-392. Kremer, R.J. 2014. Environmental implications of herbicide resistance: soil biology and ecology. Weed Science. 62(2):415-426. Rosenbaum, K.K., Miller, G.L., Kremer, R.J., Bradley, K.W. 2014. Interactions between glyphosate, fusarium infection of common waterhemp (Amaranthus rudis), and soil microbial abundance and diversity in soil collections from Missouri. Weed Science. 62(1):71-82. Sadler, E.J., Sudduth, K.A., Lerch, R.N., Baffaut, C., Kitchen, N.R. 2014. A simple index explains annual atrazine transport from surface runoff-prone watersheds in the north-central USA. Hydrological Processes. 28(2):210-217. Senaviratne, G.A., Udawatta, R.P., Anderson, S.H., Baffaut, C., Thompson, A. 2014. Use of fuzzy rainfall-runoff predictions for claypan watersheds with conservation buffers in Northeast Missouri. J of Hydrology. 517:1008-1018. Senaviratne, G. A., Udawatta, R. P., Baffaut, C., Anderson, S. H. Evaluation of a stepwise, multiobjective, multivariable parameter optimization method for the APEX model. J. Environ. Quality. 43(4):1381-1391. Sudduth, K.A., Kim, H.J., Motavalli, P.P. 2014. Soil. In: Moretto, L., Kalcher, K. editors. Environmental Analysis by Electrochemical Sensors and Biosensors, Vol. 1: Fundamentals. New York, NY: Springer. p. 23-61. Tomer, M.D., Sadler, E.J., Lizotte Jr, R.E., Bryant, R.B., Potter, T.L., Moore, M.T., Veith, T.L., Baffaut, C., Locke, M.A., Walbridge, M.R. 2014. A decade of conservation effects assessment research by USDA-ARS: Progress overview and future outlook. J of Soil and Water Conservation. 69(5):365-373. Veum, K.S., Goyne, K.W., Kremer, R.J., Miles, R.J., Sudduth, K.A. 2014. Biological indicators of soil quality and soil organic matter characteristics in an agricultural management continuum. Biogeochemistry. 117(1):81-99. Vories, E.D., Evett, S.R. 2014. Irrigation challenges in the sub-humid US mid-south. International Journal of Water. 8(3):259-274. Wikle, C.K., Holan, S.H., Sudduth, K.A., Myers, D. 2014. Soil property estimation and design for agroecosystem management using hierarchical geospatial functional data models. J of the Indian Society of Agricultural Statistics. 68(2):203-216. Wilson, C.G., Kuhnle, R.A., Dabney, S.M., Lerch, R. N., Huang, C.H., King, K.W., and Livingston, S.J. 2014. Fine sediment sources in Conservation Effects Assessment Project watersheds. J of Soil and Water Conservation. 69(5):402-413. Willett, C.D., Lerch, R.N., Goyne, K.G., Leigh, N.D., Lin, C.H., Roberts, C.A. 2014. A simple method for isolation and purification of DIBOA-Glc from Tripsacum dactyloides (L.). Natural Product Communications. 9(9):1283-1286. Yang, W., Wikle, C.K., Holan, S.H., Myers, D.B., Sudduth, K.A. 2014. Bayesian analysis of spatially-dependent functional responses with spatially-dependent multi-dimensional functional predictors. Statistica Sinica. 25:205-223.

2013 Baffaut, C., Ghidey, F., Sudduth, K.A., Lerch, R.N., Sadler, E.J. 2013. Long-term suspended sediment transport in the Goodwater Creek Experimental Watershed and Salt River Basin, Missouri, USA. Water Resources Research. 49(11):7827-7830.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 6 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Chu, B., Anderson, S.H., Goyne, K.W., Lin, C., Lerch, R.N. 2013. Sulfamethazine transport in agroforestry and cropland soils. Vadose Zone J. 12(2). Chu, B., Goyne, K.W., Anderson, S.H., Lin, C., Lerch, R.N. 2013. Sulfamethazine sorption to soil: vegetative management, pH, and dissolved organic matter effects. J. of Environmental Quality. 42:794-805. Chung, S., Sudduth, K.A., Motavalli, P.P., Kitchen, N.R. 2013. Relating mobile sensor soil strength to penetrometer cone index. Soil & Tillage Research. 129:9-18. James, R.R., Lawrence, C.J., Papiernik, S.K., Van Tassell, C.P., Ahuja, L.R., Baxter, I.R., Cannon, S.B., Lunney, J.K., Rexroad Iii, C.E., Sadler, J., Stanton, T.B., Stephensen, C.B. 2013. Big data computing: Building a vision for ARS information management. USDA. Agricultural Research Service Publication. Kim, H., Kim, W., Roh, M., Kang, C., Park, J., Sudduth, K.A. 2013. Automated sensing of hydroponic macronutrients using a computer-controlled system with an array of ionselective electrodes. Computers and Electronics in Agriculture. 93:46-54. Kim, H., Sudduth, K.A., Hummel, J.W., Drummond, S.T. 2013. Validation testing of a soil macronutrient sensing system. Transactions of the ASABE. 56(1):23-31. Kremer, R.J. 2013. Interactions between plants and microorganisms. Allelopathy J. 31(1):50-71. Kremer, R.J., Souissi, T. 2013. Phytotoxicity assessment for potential biological control of leafy spurge by soilborne microorganisms. Australasian Plant Pathology. 42(4):441-447. Lerch, R.N., Harbourt, C.M., Broz, R.R., Thevary, T.J. 2013. Atrazine incorporation and soil erosion: balancing competing water quality concerns for claypan soils. Transactions of the ASABE. 56(6):1305-1316. Oliveira, L.F., Scharf, P.C., Vories, E.D., Drummond, S.T., Dunn, D.J., Stevens, W.E., Bronson, K.F., Benson, N.R., Hubbard, V.C., Jones, A.S. 2013. Calibrating canopy reflectance sensors to predict optimal mid-season nitrogen rate for cotton. Soil Science Society of America J. 77(1):173-183. Pittman, B., Jones, J.R., Kremer, R.J., Millspaugh, J., Downing, J.A. 2013. Sediment organic carbon distribution in 4 small northern Missouri impoundments: implications for sampling and carbon. Inland Waters: J. of the International Society of Limnology. 3(1):39-46. Ponce Campos, G., Zhang, Y., Huxman, T., Mcclaran, M., Moran, M.S., Bresloff, C., Huete, A., Eamus, D., Bosch, D.D., Buda, A.R., Gunter, S.A., Kitchen, S., Mcnab, W., Morgan, J.A., Peters, D.C., Sadler, E.J., Seyfried, M.S., Starks, P.J., Montoya, D., Scalley, T. 2013. Ecosystem resilience despite large-scale altered hydroclimatic conditions. Nature. 494:349-352. Saia, S.M., Brooks, E.S., Easton, Z.M., Baffaut, C., Boll, J., Steenhuis, T.S. 2013. Incorporating pesticide transport into the WEPP-UI Model for mulch tillage and no tillage plots with an underlying claypan soil. Applied Engineering in Agriculture. 29(3):373-382. Senaviratne, G. A., Udawatta, R.P., Baffaut, C., Anderson, S.H. 2013. Agricultural Policy Environmental eXtender simulation of three adjacent row-crop watersheds in the claypan region. J. of Environmental Quality. 42:726-736. Shao, H., Baffaut, C., Gao, J.E., Nelson, N.O., Janssen, K.A., Pierzynski, G.M., Barnes, P.L. 2013. Development and application of algorithms for simulating terraces practices within SWAT. Transactions of the ASABE. 56(5):1715-1730. Sudduth, K.A., Myers, D.B., Kitchen, N.R., Drummond, S.T. 2013. Modeling soil electrical conductivity-depth relationships with data from proximal and penetrating ECa sensors. Geoderma. 199:12-21.

USDA Agricultural Research Service Cropping Systems & Water Quality Research Unit Publications List Page 7 Updated 12/28/2017

Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Unger, I.M., Goyne, K.W., Kennedy, A.C., Kremer, R.J., McLain, J.E., Williams, C.F. 2013. Antibiotic effects on microbial community characteristics in soils under conservation management practices. Soil Science Society of America J. 77:100–112. Unger, I.M., Goyne, K.W., Kremer, R.J., Kennedy, A.C. 2013. Microbial community diversity in agroforestry and grass vegetative filter strips. Agroforestry Systems. 87:395-402. Willett, C.D., Lerch, R.N., Lin, C., Goyne, K.W., Leigh, N.D., Roberts, C.A. 2013. Identification of an atrazine-degrading benzoxazinoid in Eastern gamagrass (Tripsacum dactyloides). J. of Agricultural and Food Chemistry. 61(34):8026-8033. Vories, E.D., Stevens, W.E., Tacker, P., Griffin, T.W., Counce, P.A. 2013. Rice production with center pivot irrigation. Applied Engineering in Agriculture. 29(1):51-60.

2012

Chaudhary, V.P., Sudduth, K.A., Kitchen, N.R., Kremer, R.J. 2012. Reflectance spectroscopy detects management and landscape differences in soil carbon and nitrogen. Soil Science Society of America J. 76(2):597-606. Landers, G.W., Thompson, A.L., Kitchen, N.R., Massey, R.E. 2012. Comparative breakeven analysis of annual grain and perennial switchgrass cropping systems on claypan soil landscapes. Agronomy Journal. 104(3):639–648. Lee, D.H., Sudduth, K.A., Drummond, S.T., Chung, S.O., Myers, D.B. Automated yield map delay identification using phase correlation methodology. Transactions of the ASABE. 55(3):743-752. 2012. Kremer, R.J., Hezel, L.F. 2012. Soil health restoration under an ecologically based farming system in northwest Missouri. Renewable Agriculture and Food Systems. p. 1-10 Mugdal, A., Baffaut, C., Anderson, S.H., Sadler, E.J., Kitchen, N.R., Sudduth, K.A., Lerch, R.N. 2012. Using APEX to develop and validate physically-based indices for the delineation of critical management areas. J. of Soil and Water Conservation. 67: 284-299. Paudel, B.R., Udawatta, R.P., Kremer, R.J., Anderson, S.H. 2012. Soil quality indicator responses to row crop, grazed pasture, and agroforestry buffer management. Agroforestry Systems. 84:311–323. Stevens, W.E., Vories, E.D., Heiser, J.W., Rhine, M.D. 2012. Experimentation on cultivation of rice irrigated with a center pivot system. In: Lee, T.S. editor. Irrigation Systems and Practices in Challenging Environments. Rijeka, Croatia: InTech. p. 233-254. Unger, I.M., Goyne, K.W., Kennedy, A.C., Kremer, R.J. 2012. Microbial community diversity in agroforestry and grass vegetative filter strips. Agroforestry Systems. 87(2):395-402. Vasques, G.M., Grunwald, S., Myers, D.B. 2012. Associations between soil carbon and ecological landscape drivers at escalating spatial scales in Florida, USA. Landscape Ecology. 27:355-367. Wang, X., Williams, J.R., Gassman, P.W., Baffaut, C., Izaurralde, C., Jeong, J., Kiniry, J.R. 2012. The EPIC and APEX models: use, calibration and validation. Transactions of the ASABE. 55(4):1447-1462. Willett, C.D., Lerch, R.N., Schultz, R.C., Berges, S.A., Peacher, R.D., Isenhart, T.M. 2012. Streambank erosion in two watersheds of the central claypan region of Missouri, United States. J.of Soil and Water Conservation Society. 67(4):247-261. Zobiole, L.H.S., Kremer, R.J., Oliveira, Jr., R.S., Constantin, J., 2012. Glyphosate effects on photosynthesis, nutrient accumulation, and nodulation in glyphosate-resistant soybean. J. Plant Nutr. Soil Sci. 175, 319–330.

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2011 Adamchuk, V.I., Viscarra Rossel, R.A., Sudduth, K.A., Schulze Lammers, P. 2011. Sensor fusion for precision agriculture. In: Thomas, C., editor. Sensor Fusion – Foundation and Applications. Croatia: In-Tech. p. 27-40. Bellaloui, N., Reddy, K.N., Bruns, H.A., Gillen, A.M., Mengistu, A., Zobiole, L.H., Fisher, D.K., Abbas, H.K., Zablotowicz, R.M., Kremer, R.J. 2011. Soybean seed composition and quality: interactions of environment genotype and management practices. Nova Hedwigia. 1:1-42.

Bockhold, D.L., Thompson, A.L., Sudduth, K.A., Henggeler, J.C. 2011. Irrigation scheduling based on crop canopy temperature for humid environment. Transactions of the ASABE. 54(6):2021-2028. Bronson, K.F., Scharf, P.C., Kitchen, N.R. 2011. Use of GIS-based site-specific nitrogen management for improving energy efficiency. In: Clay, D.E., Shanahan, J.F., editors.GIS Applications in Agriculture, Volume Two, Nutrient Management for Energy Efficiency. Boca Raton, Florida. CRC Press. p. 359-384. Chung, S.O., Jung, K.Y., Sudduth, K.A. 2011. Estimation of Korean paddy field soil properties using optical reflectance. J. of Biosystems Engineering. 36(1):33-39. Delgado, J.A., Secchi, S., Groffman, P., Nearing, M.A., Goddard, T., Reicocky, D., Lal, R., Salon, P., Kitchen, N.R., Rice, C., Towery, D. 2011. Conservation practices to mitigate and adapt to the effects of climate change. J. of Soil and Water Conservation Society. 66(a):118A-129A. Kitchen, N.R. 2011. Growing the science of agronomy by growing the profession: a message from the President of the American Society of Agronomy. In: Proc. of Indo-US Workshop on Precision Agriculture, February 28-March 3, 2011, Ludhiana, India. p. 15-16. Kremer, R.J., Kussman, R.D. 2011. Soil quality in a pecan-kura clover alley cropping system in the Midwestern USA. Agroforestry Systems. 83(2):213-223. Lerch, R.N. 2011. Contaminant transport in two central Missouri karst recharge areas. J. of Cave and Karst Studies. 73(2):99–113. Lerch, R.N., Sadler, E.J., Sudduth, K.A., Baffaut, C., Kitchen, N.R. 2011. Herbicide transport in Goodwater Creek Experimental Watershed: I. Long-term research on atrazine. J. of American Water Resources Association. 47(2):209-223. Lerch, R.N., Sadler, E.J., Baffaut, C., Kitchen, N.R., Sudduth, K.A. 2011. Herbicide transport in Goodwater Creek Experimental Watershed: II. Long-term research on acetochlor, alachlor, metolachlor, and metribuzin. J. of American Water Resources Association. 47(2):224-238. Lin, C.H., Lerch, R.N., Kremer, R.J., Garrett, H.E., George, M.F. 2011. Stimulated rhizodegradation of atrazine by selected plant species. J. of Environmental Quality. 40(4):1113-1121. Lin, C.H., Lerch,R.N., Goyne, K.W., Garrett, H.E. 2011. Reducing herbicides and veterinary antibiotics losses from agroecosystems using vegetative buffers. J. of Environmental Quality. 40(3):791-799. Miller, B.V., Lerch, R.N. 2011. Delineating recharge areas for Onondaga and Cathedral Caves using groundwater tracing techniques. Missouri Speleology. 51(2):1-36. Myers, D.B., Kitchen, N.R., Sudduth, K.A., Miles, R.J., Sadler, E.J., Grunwald, S. 2011. Peak functions for modeling high resolution soil profile data. Geoderma. 166(1):74-83. O’Donnell, T.K., Goyne, K.W., Miles, R.J., Baffaut, C., Anderson, S.H., Sudduth, K.A. 2011. Determination of representative elementary areas for soil redoximorphic features identified by digital image processing. Geoderma. 161:138-146.

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Pengthamkeerati, P., Motavalli, P.P., Kremer, R.J. 2011. Soil microbial activity and functional diversity changed by compaction, poultry litter and cropping in a claypan soil. Applied Soil Ecology. 48(1):71-80. Pengthamkeerati, P., Motavalli, P.P., Kremer, R.J. 2011. Soil microbial biomass nitrogen and β-glucosaminidase activity response to surface compaction and poultry-litter application in a claypan soil. Applied Soil Ecology. 51:79-86. Ponce, G., Moran, M.S., Huete, A., Bresloff, C., Huxman, T., Bosch, D.D., Bradford, J., Buda, A.R., Gunter, S.A., Mcnab, H., Mcclaran, M., Peters, D.C., Sadler, E.J., Seyfried, M.S., Starks, P.J., Sutherland Montoya, D., Heartsill, T. 2011. Convergence of dynamic vegetation net productivity responses to precipitation variability from 10 years of MODIS EVI. ISRSE 2011, 34th International Symposium on Remote Sensing of Environment, Sydney Convention and Exhibition Centre, 10-15 April 2011. Rhine, M. D., Stevens, G., Heiser, J. W., Vories, E.D. 2011. Nitrogen fertilization on center pivot sprinkler irrigated rice. Crop Management.10(1). Roberts, D.F., Ferguson, R.B., Kitchen, N.R., Adamchuk, V.I., Shanahan, J.F. 2011. Relationships between soil-based management zones and canopy sensing for corn nitrogen management. Agronomy J. 104(1):119-129. Sadler, E.J., Baker, J.M., Ringler, C. 2011. Implications of climate change for water surplus and scarcity and how that affects agricultural sustainability in Hungary. Challenges and Opportunities in Agriculture, Proc. AGRISAFE Final Conference, March 21-23, 2011, Budapest, Hungary. p. 50-55. Scharf, P.C., Kitchen, N.R. 2011. Use of GIS-based site-specific nitrogen management for improving energy efficiency. In: Clay, D. E., Shanahan, J. F., editors. GIS Applications in Agriculture. Volume Two: Nutrient Management for Energy Efficience. Boca Raton, FL: CRC Press. p. 359-384. Scharf, P.C., Shannon, D.K., Palm, H.L., Sudduth, K.A., Drummond, S.T., Kitchen, N.R., Mueller, L.J., Hubbard,V.C., Oliviera,L.F. 2011. Sensor-based nitrogen applications out-performed producer-chosen rates for corn in on-farm demonstrations. Agronomy J. 103:1683-1691. Sheridan, A.H., Kitchen, N.R., Sudduth, K.A., Drummond, S.T. 2011. Corn hybrid growth stage influence on crop reflectance sensing. Agronomy J. 104(1):158-164. Sudduth, K.A., Myers, D.B., Kitchen, N.R., Drummond, S.T. 2011. Mapping conductivity-depth relationships by combining proximal and penetrating ECa sensors. In Proc. of the 2nd Global Workshop on Proximal Soil Sensing, Montreal, Canada, p. 32-35. Vories, E.D., Greene, J.K., Teague, T.G., Stewart, J.H., Phipps, B.J., Pringle, H.C., Clawson, E.L., Hogan, R.J., O’Leary, P.F., Griffin, T.W. 2011. Determining the optimum timing for the final furrow irrigation on Mid-South cotton. Appl. Eng. Agric. 27(5):737-745. Wu, S.H., Goyne, K.G., Lerch, R.N., Lin, C.H. 2011. Adsorption of isoxaflutole degradates to aluminum and iron hydrous oxides. J. Environ. Quality. 40(2):528-537.

2010

Baffaut,C., Sadeghi, A.M. 2010. Bacteria Modeling with SWAT for Assessment and Remediation Studies - A Review. Transactions of the ASABE. 53(3):1585-1594. Finocchiaro, R.G., Kremer, R.J. 2010. Effect of Municipal Wastewater as a Wetland Water Source on Soil Microbial Activity. Communications in soil science and plant analysis. 41(16-19):1974-1985.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Ghidey, F., Baffaut, C., Lerch, R.N., Kitchen, N.R., Sadler, E.J., Sudduth, K.A. 2010. Herbicide transport to surface runoff from a claypan soil: Scaling from plots to fields. J. of Soil and Water Conservation. 65(3):168-179. Jung, K.Y., Kitchen, N.R., Sudduth, K.A., Lee, K.S., Chung, S.O. 2010. Soil compaction varies by crop management system over a claypan soil landscape. Soil & Tillage Research. 107(1):1-10. Kitchen, N.R., Sudduth, K.A., Drummond, S.T., Scharf, P.C., Palm, H.L., Roberts, D.F., Vories, E.D. 2010. Ground-based canopy reflectance sensing for variable-rate nitrogen corn fertilization. Agronomy J. 102:71-84. Kitchen, N.R., Sudduth, K.A., Kremer, R.J., Myers, D.B. 2010. Sensor-based mapping of soil quality on degraded claypan landscapes of the central United States. In: Viscarra Rossel, R. A., McBratney, Alex B., and Minasny, B. Proximal Soil Sensing, Volume 1. New York: Springer. p. 363-373. Lee, K.S., Sudduth, K.A., Drummond, S.T. Lee, D.H., Kitchen, N.R., Chung, S.O. 2010. Calibration methods for soil property estimation using reflectance spectroscopy. Transactions of the ASABE. 53(3):675-684. Lin, C.H., Goyne, K.W., Kremer, R.J., Lerch, R.N., Garrett, H.E. 2010. Dissipation of sulfamethazine and tetracycline in the root zone of grass and tree species. J. of Environmental Quality. 39(4):1269-1278. Mudgal, A., Anderson, S.H., Baffaut, C., Kitchen, N.R., Sadler, E.J. 2010. Effects of long-term soil and crop management on soil hydraulic properties for claypan soils. J. of Soil and Water Conservation. 65(6):393-403. Mudgal, A., Baffaut, C., Anderson, S.H., Sadler, E.J.,Thompson, A.L. 2010. APEX model assessment of variable landscapes on runoff and dissolved herbicides. Transactions of the ASABE. 53(4):1047-1058. O'Donnell, T.K., Goyne, K.W., Miles, R.J., Baffaut, C., Anderson, S.H., Sudduth, K.A. 010. Identification and quantification of soil redoximorphic features by digital image processing. Geoderma. 157(3-4):86-96. Roberts, D.F., Kitchen, N.R. Scharf, P.C., Sudduth, K.A. 2010. Will variable-rate nitrogen fertilization using corn canopy reflectance sensing deliver environmental benefits?. Agronomy J. 102:85-95. Roberts, D.F., Kitchen, N.R., Sudduth, K.A., Drummond, S.T., Scharf, P.C. 2010. Economic and Environmental Implications of Sensor-based N Management. Better Crops with Plant Food. XCIV (94):4-6. Souza, E.G., Scharf, P.C., Sudduth, K.A. 2010. Sun position and clouds effects on reflectance and vegetation indices of corn. Agronomy J. 102:734-744. Stone, K.C., Camp, C.R., Sadler, E.J., Evans, D.E., Millen, J.A. 2010. Corn Yield Response to Nitrogen Fertilizer and Irrigation in the Southeastern Coastal Plain. Applied Engineering in Agriculture. 26(3):429-438. Sudduth, K.A., Kitchen, N.R., Myers, D.B., Drummond, S.T. 2010. Mapping depth to argillic soil horizons using apparent electrical conductivity. J. of Environmental and Engineering Geophysics. 15(3):135-146. Thompson, B., Lin, C., Hsieh, H., Kremer, R.J., Lerch, R.N., Garrett, H.E. 2010. Evaluation of PCR-based quantification techniques to estimate the abundance of atrazine chlorohydrolase gene atzA in rhizosphere soils. Journal of Environmental Quality. 39(6):1999-2005. Williams, J.D., Kitchen, N.R., Scharf, P.C., Stevens, W.E. 2010. Within-field nitrogen response in corn related to aerial photograph color. Precision Agriculture. 11:291-305. Wrather, J.A., Stevens, W.E., Vories, E.D., Kirkpatrick, T.L., Mueller, J.D., Mauromoustakos, A. 2010. The use of root gall ratings to determine high risk zones in cotton fields infested by Meloidogyne incognita. Crop Science. 50(6):2575-2579. Zobiole, L.H., Oliveira Jr., R.S., Kremer, R.J., Muniz, A.S., Oliveira Jr., A.O. 2010. Nutrient accumulation and

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

photosynthesis in glyphosate-resistant soybeans is reduced under glyphosate use. J. of Plant Nutrition. 33(12):1860-1873. Zobiole, L.H., Oliveira, R.S., Kremer, R.J., Constantin, J., Bonato, C.M., Muniz, A.S. 2010. Water use efficiency and photosynthesis of glyphosate-resistant soybean as affected by glyphosate. Pesticide Biochemistry and Physiology. 97:182–193. Zobiole, L.H., Oliveira, R.S., Kremer, R.J., Constantin, J., Yamada, T., Castro, C., Oliveira, F.A., Oliveira, A. 2010. Effect of glyphosate on symbiotic N2 fixation and nickel concentration in glyphosate-resistant soybean. Applied Soil Ecology. 44(2):176-180. Zobiole, L.H., Kremer, R.J., Oliveira Jr., R.S., Constantin, J. 2010. Glyphosate affects photosynthesis in first and second generation of glyphosate-resistant soybeans. Plant and Soil. 336(1-2):251-265. Zobiole, L.H., Oliveira Jr., R.S., Visentainer, J.V., Kremer, R.J., Bellaloui, N., Yamada, T. 2010. Glyphosate affects seed composition in glyphosate-resistant soybean. J. of Agricultural and Food Chemistry. 58(7):4517-4522.

2009

Baffaut, C., Benson, V.W. 2009. Modeling flow and pollutant transport in a karst watershed with SWAT. Transactions of the ASABE. 52(2):469-479. Bauer, P.J., Foulk, J.A., Gambler, G.R., Sadler, E.J. 2009. A comparison of two cotton cultivars differing in maturity for within-canopy fiber property variation. Crop Science. 49(2):651-657. Finocchario, R.G., Kremer, R.J., Frederickson, L.H. 2009. Impact of municipal wastewater effluent on seed bank response and soils excavated from a wetland impoundment. Wetlands: the J. of the Society of the Wetland Scientist. 29(2):713-723. Henggeler, J.C. and Vories, E.D. 2009. Evaluating center pivot distribution uniformity from catch can tests. ASABE, St. Joseph, MI. Paper No. 096044. Jang, G.S., Sudduth, K.A., Sadler, E.J., Lerch, R.N. 2009. Watershed-scale crop type classification using seasonal trends in remote sensing-derived vegetation indices. Transactions of the ASABE. 52(5):1535-1544. Jiang, P., Zhuoqiong, H., Kitchen, N.R., Sudduth, K.A. 2009. Bayesian analysis of within-field variability of corn yield using a spatial hierarchical model. Precision Agriculture. 10(2):111-127. Kim, H.J., Sudduth, K.A., Hummel, J.W. 2009. Soil macronutrient sensing for precision agriculture. J. of Environmental Monitoring. 11:1810-1824. Kremer, R.J., Ben-Hammouda, M. 2009. Allelopathic plants: 19. Barley (Hordeum vulgare L). Allelopathy J. 24(2):225-242. Kremer, R.J., Means, N.E. 2009. Glyphosate and glyphosate-resistant crop interactions with rhizosphere microorganisms. European J. of Agronomy. 31(3):153-161. Lee, K.S., Lee, D.H., Sudduth, K.A., Chung, S.O., Kitchen, N.R., Drummond, S.T. 2009. Wavelength identification and diffuse reflectance estimation for surface and profile soil properties. Transactions of the ASABE. 52(3):683-695. Noellsch, A.J., Motavalli, P.P., Nelson, K.A., Kitchen, N.R. 2009. Corn response to conventional and slow-release

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

nitrogen fertilizers across a claypan landscape. Agronomy J. 101(3):607-614. Oueslati, O., Ben-Hammouda, M., Ghorbel, M.H., El Gazzeh, M., Kremer, R.J. 2009. Role of phenolic acids in expression of barley (Hordeum vugare) autotoxicity. Allelopathy J. 23(1):157-166. Schomberg, H.H., Weitholter, S., Griffin, T.S., Reeves, D.W., Cabrera, M.L., Fisher, D.S., Endale, D.M., Balkcom, K.S., Raper, R.L., Kitchen, N.R., Locke, M.A., Potter, K.N., Schwartz, R.C., Trumank, C.C., Tyler, D.D. 2009. Assessing indices for predicting potential nitrogen mineralization in soils under different management systems. Soil Science Society of America J. 73(5):1575-1586. Steiner, J.L., Sadler, E.J., Wilson, G., Hatfield, J., James, D., Vandenberg, B., Chen, J.S., Oster, T., Ross, J.D., Cole, K. 2009. STEWARDS watershed data system: system design and implementation. Transactions of the ASABE. 52(5):1523-1533. Steiner, J.L., Sadler, E.J., Hatfield, J.L., Wilson, G., James, D.E., Vandenberg, B., Ross, J.D., Oster, T., Cole, K. 2009. Data management to enhance long-term watershed research: Context and STEWARDS case study. J. of Ecohydrology. 2:391-398. Udawatta, R.P., Kremer, R.J., Garrett, H.E., Anderson, S.H. 2009. Soil enzyme activities and physical properties in a watershed managed under agroforestry and row-crop systems. Agriculture, Ecosystems & Environment. 31(1-2):98-104. Vories, E.D., Tacker, P.L., Lancaster, S.W., Glover, R.E. 2009. Subsurface drip irrigation of corn in the United States Mid-South. Agricultural Water Management. 96(6):912-916. Williams, J.D., Kitchen, N.R., Scharf, P.C., Stevens, W.E. 2009. Within-field corn nitrogen response related to aerial photograph color. Precision Agriculture. 11(3):291-305. Yamada, T., Kremer, R.J., Castro, P.R., Wood, B.W. 2009. Glyphosate interactions with physiology, nutrition, and diseases of plants: threat to agricultural sustainability? European J. of Agronomy. 31(3):111-113.

2008

Adamchuk, V.I., Ingram, T.J., Sudduth, K.A., Chung, S.O. 2008. On-the-go mapping of soil mechanical resistance using a linear depth effect model. Transactions of the ASABE. 51(6):1885-1894.

Chung, S.O., Jung, I.K., Sung, J.H., Sudduth, K.A., Drummond, S.T. 2008. Analysis of spatial variability in a Korean paddy field using median polish detrending. J. of Biosystems Engineering. 33(5):362-369.

Chung, S.O., Sudduth, K.A., Plouffe, C., Kitchen, N.R. 2008. Soil bin and field tests of an on-the-go soil strength profile sensor.. Transactions of the ASABE. 51(1):5-18.

Chung, S.O., Sudduth, K.A., Tan, J. 2008. Spectral analysis of on-the-go soil strength sensor data. J. of Biosystems Engineering. 33(5):355-361.

Evans, R. G., Sadler, E. J. 2008. Methods and technologies to improve efficiency of water use. Water Resources Research. 44(7): W00E04 (15 pp.).

Hezel, Linda, Kremer, R.J. 2008. Healing and building soil on Prairie Birthday Farm. Missouri Prairie J. 29(3):14-20.

Hoilett, N.O., Nkongolo, M., Kremer, R.J., Eivazi, F., Adisa, S.J., Paro, R.M., Schmidt, K. 2008. Understanding the relationships between microbial biomass, enzymes and greenhouse gas efflux in a secondary forest in Missouri. J.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

of Environmental Monitoring. 5(1):109-118. Holan, S., Wang, S., Arab, A., Sadler, E.J., Stone, K.C. 2008. Semiparametric geographically weighted response curves with application to site-specific agriculture. J. of Agricultural Biological and Environmental Statistics. 13(4):424-439.

Jiang, P., Kitchen, N.R., Anderson, S.A., Sudduth, K.A., Sadler, E.J. 2008. Estimating plant-available water using the simple inverse yield model for claypan landscapes. Agron. J. 100:830-836. Jung, W.K., Kitchen, N.R., Sudduth, K.A., Kremer, R.J. 2008. Contrasting grain crop and grassland management effects on soil quality properties for a north-central Missouri claypan soil landscape. Soil Science and Plant Nutrition. 54:960-971. Kitchen, N.R., Goulding, K.W.T., Shanahan, J.F. 2008. Proven practices and innovative technologies for on-farm crop nitrogen management. Chapter 15, 483-517 In: J. L. Hatfield & R. F. Follett (eds) Nitrogen in the Environment: Sources, Problems, and Management, Second edition, ed. Academic Press, San Diego. Kitchen, N.R. 2008. Emerging technologies for real-time and integrated agriculture decisions. Computers and Electronics in Agriculture. 61(1):1-3. Lee, K.S., Lee, D.H., Jung, I.K., Chung, S.O., Sudduth, K.A. 2008. Sampling and calibration requirements for optical reflectance soil property sensors for Korean paddy soils. J. of Biosystems Engineering. 33(4):260-268.

Lerch, R.N., Sadler, E.J., Kitchen, N.R., Sudduth, K.A., Kremer, R.J. Myers. D.B., Baffaut, C., Anderson, S.H., Lin, C.H. 2008. Overview of the Mark Twain Lake/Salt River Basin conservation effects assessment project. J. Soil Water Cons. 63(6):345-359. Lin, C.H., Lerch, R.N., Garrett, H.E., George, M.F. 2008 Bioremediation of atrazine-contaminated soil by forage grasses: transformation, uptake, and detoxification. J. Environ. Qual. 37:196–206.

Massey, R., Myers, D.B., Kitchen, N.R., Sudduth, K.A. 2008. Profitability maps as an input for site-specific management decision making. Agronomy J. 100:52-59.

Richardson, C.W., Bucks, D.A., Sadler, E.J. 2008. The Conservation Effects Assessment Project benchmark watersheds: synthesis of preliminary findings. J. of Soil and Water Conservation. 63(6):590-604.

Sadler, E.J., Steiner, J.L., Chen, J.S., Wilson, G., Ross, J.D., Oster, T., James, D., Vandenberg, B., Cole, K., Hatfield, J. 2008. Sustaining the earth's Watersheds-Agricultural Research Data System: data development, user interaction, and operations management. J. of Soil and Water Conservation. 63(6):577-589.

Shanahan, J.F., Kitchen, N.R., Raun, W.R., Schepers, J.S. 2008. Responsive in-season nitrogen management for cereals. Computers and Electronics in Agriculture. 61(1):51-62. Steiner, J.L., Sadler, E.J., Chen, J.S., Wilson, G., James, D., Vandenberg, B., Ross, J.D., Oster, T. 2008. Sustaining the earth's Watersheds-Agricultural Research Watershed Data System: overview. J. of Soil and Water Conservation. 63(6):569-576.

Stevens, G., Wrather, A., Rhine, M., Vories, E.D., Dunn, D. 2008. Predicting rice yield response to midseason nitrogen with plant area measurements. Agron. J. 100(2):387-392. Sudduth, K.A., Chung, S.O., Andrade-Sanchez, P., Upadhyaya, S.K. 2008. Field comparison of two prototype soil strength profile sensors. Computers and Electronics in Agriculture. 61:20-31

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Udawatta, R.P., Kremer, R.J., Adamson, B.W., Anderson, S.H. 2008. Variations in soil aggregate stability and enzyme activities in a temperate agroforestry practice. Appl. Soil Ecol. 39(2):153-160.

Viator, R.P., Gwathmey, C.O., Cothren, J.T., Reed, J.T., Vories, E.D., Nuti, R.K., Edmisten, K.L., Wells, R. 2008. Influence of ultranarrow row and conventional row cotton on the last effective boll population. Agronomy J. 100(5):1327-1331. Wrather, J.A., Phipps, B.J., Stevens, W.E., Phillips, A.S., Vories, E.D. 2008. Cotton planting date and plant population effects on yield and fiber quality in the Mississippi delta. J. Cotton Sci. 12(1):1-7.

2007

Bajwa, S.G., Vories, E.D. 2007. Spatial analysis of cotton (Gossypium hirsutum L.) canopy responses to irrigation in a moderately humid area. Irrig. Sci. 25(4):429-441. Branch, B., Daniels, G., Thomas, D., Ocampo, L., Clawson, E., Clemmens, A.J., Vories, E.D. 2007. Irrigation on level-basin field in Louisiana. National Cotton Council Beltwide Cotton Conference, January 9-12, 2007, New Orleans, Louisiana. p. 889-894 Bullock, D.S., Kitchen, N.R., Bullock, D.G. 2007. Multi-disciplinary teams – a necessity for research in precision agriculture systems. Crop Science. 47:1765-1769. Chung, S.O., Sudduth, K.A. 2007. Soil property estimation and variable tillage recommendation using geo-referenced cone index. In: Proc. 2nd Asian Conference on Precision Agriculture. August 2-4, 2007, Pyeongtaek, Korea. CDROM. Donald, W.W. 2007. Between-row mowing systems control summer annual weeds in no-till grain sorghum. Weed Technology. 21:511-517. Donald, W.W. 2007. Control of both winter annual and summer annual weeds in no-till corn with between-row mowing systems. Weed Technology. 21(3):591-601. Dunn, D., Phillips, A., Stevens, W.E., Vories, E.D. 2007. Screening cotton varieties for tolerance to water-logged soil conditions. Beltwide Cotton Conf., Jan. 9-12, 2007, Memphis, Tn. p. 467-471 [CDROM]. Fang, M., Motavalli, P.P., Kremer, R.J., Nelson, K.A. 2007. Assessing changes in soil microbial communities and carbon mineralization in Bt and non-Bt corn residue-amended soils. Applied Soil Ecology. 37:150-160. Ghidey, F., Sadler, E.J., Lerch, R.N., Baffaut, C. 2007. Scaling up the SWAT model from Goodwater Creek Experimental Watershed to the Long Branch Watershed., ASABE, St. Joseph, MI. Paper No. 072043 Hong, N., Scharf, P.C., Davis, J.G., Kitchen, N.R., Sudduth, K.A. 2007. Economically optimal nitrogen rate reduces soil residual nitrate. J. of Environmental Quality. 36:354-362 Jiang, P., Anderson, S.H., Kitchen, N.R., Sudduth, K.A., Sadler, E.J. 2007. Estimating plant-available water capacity for claypan landscapes using apparent electrical conductivity. Soil Science Society of America J. 71:1902-1908. Jiang, P., Anderson, S.H., Kitchen, N.R., Sadler, E.J., Sudduth, K.A. 2007. Landscape and conservation management effects on hydraulic properties on a claypan-soil toposequence. Soil Science Society of America J. 71:803-811. Jung, W.K., Kitchen, N.R., Anderson, S.H., Sadler, E.J. 2007. Crop management effects on water infiltration for claypan soils. J. of Soil and Water Conservation. 62(1):55-63.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Kim, H.J., Sudduth, K.A., Hummel, J.W., Drummond, S.T. 2007. Application of ionselective electrodes for simultanious analysis of soil macronutrients. In: ASABE Annual International Meeting Technical Papers. ASABE, St. Joseph, MI. Paper No. 071004. Kim, H.J., Hummel, J.W., Sudduth, K.A., Birrell, S.J. 2007. Evaluation of phosphate ion-selective membranes and cobalt-based electrodes for soil nutrient sensing. Transactions of the ASABE. 50(2):415-425. Kim, H.J., Hummel, J.W., Sudduth, K.A., Motavalli, P.P. 2007. Simultaneous analysis of soil macronutrients using ion-selective electrodes. Soil Science Society of America J., 71:1867-1877 Kim, H.J., Hummel, J.W., Sudduth, K.A., Motavalli, P.P. 2007. Ion-selective electrodes for simultaneous analysis of soil macronutrients. In: Proc. 2nd Asian Conference on Precision Agriculture. August 2-4, 2007, Pyeongtaek, Korea. CDROM. Kitchen, N.R. 2007. Incorporating nutrient sensing technology in production agriculture. 2007 Fluid Fertilizer Forum, February 18-20, 2007, Scottsdale, AZ, p.35-40 Kremer, R.J. 2007. Deleterious Rhizobacteria. In: Gnanamanickam, S., editor. Plant-Associated Bacteria. Bordrecht, the Netherlands: Kluwer Academic Publishers. p. 335-357. Lee, K.S., Lee, D.H., Sudduth, K.A., Chung, S.O., Drummond, S.T. 2007. Wavelength identification for reflectance estimation of surface and subsurface soil properties. ASABE Annual International Meeting, June 16-20, 2007, Minneapolis, MN. Paper No. 071046. Lee, D., Lee, K., Sudduth, K.A., Chung, S. 2007. Wavelength selection for reflectance estimation of surface and subsurface soil properties. In: Proc. 2nd Asian Conference on Precision Agriculture. August 2-4, 2007, Pyeongtaek, Korea. CDROM. Lerch, R.N., Lin, C.H., Leigh, N.D. 2007. Reaction pathways of the diketonitrile degradate of isoxaflutole with hypochlorite in water. J. of Agricultural and Food Chemistry. 55(5):1893-1899. Lin, C.H., Lerch, R.N., Garrett, H.E., Yong-Xi, L., George, M.F. 2007. An improved HPLC-MS/MS method for determination of isoxaflutole (Balance) and its metabolites in soils and forage plants. J. of Agricultural and Food Chemistry. 55:3805-3815. Lin, C.H., Lerch, R.N., Garrett, H.E., Jordan, D., George, M.F. 2007. Ability of forage grasses exposed to atrazine and isoxaflutole to reduce nutrient levels in soils and shallow groundwater. Communications in Soil Science and Plant Analysis. 38:1119–1136. Lin, C.H., Lerch, R.N., Garrett, H.E., Jordan, D., George, M.F. 2007. Improved GC-MS/MS method for determination of atrazine and Its chlorinated metabolites in forage plants - laboratory and field experiments. Communications in Soil Science and Plant Analysis. 38:1753–1773. Means, N.E., Kremer, R.J. 2007. Influence of soil moisture on root colonization of glyphosate-treated soybean by fusarium species. Communications in Soil Science and Plant Analysis. 38:1713-1720. Means, N.E., Kremer, R.J., Ramsier, C. 2007. Effects of glyphosate and foliar amendments on activity of microorganisms in the soybean rhizosphere. J. of Environmental Science and Health Part B. 42(2):125.132. Myers, D.B., Kitchen, N.R., Sudduth, K.A., Sharp, R.E., Miles, R.J. 2007. Soybean root distribution related to claypan soil properties and apparent soil electrical conductivity. Crop Science. 47:1498-1509. Nasraoui, B., Hajlaoui, M.R., Aissa, A.D., Kremer, R.J. 2007. Biological control of wheat take-all disease: I - characterization of antagonistic bacteria from diverse soils toward Gaeumannomyces graminis var. tritici . Tunisian

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J. Plant Protect. 2(1):23-34.

Nasraoui, B., Hajlaoui, M.R., Gargouri, S., Kremer, R.J. 2007. Biological control of wheat take-all disease: II - rapid screening for selection of bacteria suppressive to Gaeumannomyces graminis var. tritici in laboratory with greenhouse and field trials. Tunisian J. Plant Protect. 2(1):35-46.

Park, K., Kremer, R.J. 2007. Effects of a biological amendment on chemical and biological properties and microbial diversity in soils receiving different organic amendments. Korean J. Soil Sci. Fert. 40(4):234-241.

Pengthamkeerati, P., Motavalli, P.P., Kremer, R.J., Anderson, S.H. 2007. Soil compaction and poultry litter effects on factors affecting nitrogen availability in a claypan soil. Soil & Tillage Research. 91(1):109-119. Sadler, E.J., Camp, C.R., Evans, R.G. 2007. New and future technology. In American Society of Agronomy Monograph No. 30, 2nd ed., Irrigation of Agricultural Crops. ASA-CSSA-SSSA, Madison, WI. p. 609-626. Sadler, E.J., Jones, J.W., Sudduth, K.A. 2007. Modeling for precision agriculture: how good is good enough, and how can we tell? In: Stafford, J.V., ed. Precision Agriculture '07 - Proc. 6th European Conference on Precision Agriculture, June 4-6, 2007. Skiathos, Greece. 2007. p. 241-248. Sadler, E.J., Sudduth, K.A., Jones, J.W. 2007. Separating spatial and temporal sources of variation for model testing in precision agriculture. Precision Agriculture. 8(6):297-310. Smith, M.C., Massey, J.H., Branson, J., Epting, J., Pennington, D., Tacker, P., Thomas, J., Vories, E.D., Wilson, C. 2007. Water use estimates for various rice production systems in Mississippi and Arkansas. Irrig. Sci. 25(2):141-147. Stevens, W., Vories, E.D., Mulesky, M., Rhine, M., Dunn, D. 2007. Irrigation to maximize vaccine antigen production in genetically modified tobacco. Agron. J. 99(5):1271-1277. Sudduth, K.A. 2007. Current status and future directions of precision agriculture in the USA. In: Proc. 2nd Asian Conference on Precision Agriculture. August 2-4, 2007, Pyeongtaek, Korea. CDROM. Sudduth, K.A., Drummond, S.T. 2007. Yield editor: software for removing errors from crop yield maps. Agronomy J. 99:1479-1482. Sudduth, K.A., Kitchen, N.R., Sadler, E.J., Kremer, R.J., Lerch, R.N. 2007. Precision management systems for conservation and profitability. ASABE Annual International Meeting Papers. ASABE, St. Joseph, MI. Paper No. 071090. Udawatta, R.P., Kremer, R.J., Garrett, H.E., Anderson, S.H. 2007. Soil aggregate stability and enzyme activity in agroforestry and row-cropping systems. In A. Olivier and S. Campeau (ed.) When trees and crops get together: Economic Opportunities and Environmental Benefits of Agroforestry. Proc. of the 10th North American Agroforestry Conference, June 10-13, 2007, University Laval, Quebec City, Quebec, Canada. p. 165-175 Vories, E.D., Hogan, R., Tacker, P., Glover, R., Lancaster, S. 2007. Estimating the impact of delaying irrigation for Midsouth cotton on clay soil. Trans. ASABE. 50(3):929-937. Vories, E.D., Fisher, D.K., Tacker, P.L., Sudduth, K.A. 2007. Using wireless technology to reduce water use in rice production. U.S. Committee on Irrigation and Drainage Fourth Int. Conf. on Irrig. and Drain. Denver, Co., Oct. 3-6, 2007, USCID: 471-480. CDROM. Vories, E.D., Perry, C., Stephenson, D., Tacker, P. 2007. Site-specific irrigation in the USA. Proc. 2nd Asian Conf. on Prec. Agric. (ACPA). Aug. 2-4, 2007, Pyeongtaek, Korea. CDROM.

2006

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Adamchuk, V.I., Sudduth, K.A., Ingram, T.J., Chung, S. 2006. Comparison of two alternative methods to map soil mechanical resistance on-the-go. ASABE Annual International Meeting Proc., July 9-12, 2006, Portland, OR. 06-1057 Bajwa, S.G., Vories, E.D. 2006. Spectral response of cotton canopy to water stress. ASABE Annual International Meeting, July 9-12, 2006, Portland Oregon. P.061064, CDROM. Chen, J., Steiner, J.L., Sadler, E.J. 2006. An ARS data system for assessing conservation practices in watershed studies. In: Proc. of the 2nd Interagency Conference on Research in the Watersheds, May 15-18, 2006, Cowetta Hydro Lab, NC. p. 25-31. Chung, S.O., Sudduth, K.A. 2006. Soil failure models for vertically operating and horizontally operating strength sensors. Transactions of the ASABE. 49(4):851-863. Chung, S.O., Sudduth, K.A., Hummel, J.W. 2006. Design and validation of an on-the-go soil strength profile sensor. Transactions of the ASABE. 49(1):5-14. Chung, S., Sudduth, K.A., Lee, K., Motavalli, P. 2006. Characterization of cone index to define compaction management parameters. In. Proc. of the International Soil Tillage Research Organization 17th Triennial Conference, August 28-September 3, 2006, Kiel, Germany. CDROM. Clay, D.E., Kitchen, N.R., Carlson, C.G., Kleinjan, J.L. 2006. The first step in precision agriculture: sampling old farmsteads separately from the rest of the field. Site-Specific Management Guidelines. SSMG-43. Donald, W.W. 2006. Mowing for weed management. In: Singh, H.P., Batish, D.R., Kohli, R.K. (editors). Handbook of Sustainable Weed Management. Binghamton, NY: Food Products Press. p. 329-372.

Donald, W.W. 2006. Between-observer differences in relative corn yield vs. rated weed control. Weed Technology. 20(1):41-51. Donald, W.W. 2006. Preemergence banded herbicides followed by only one between-row mowing controls weeds in corn. Weed Technology. 20(1):143-149. Donald, W.W. 2006. Estimated corn yields using either weed cover or rated control after pre-emergence herbicide. Weed Science. 54:373-379. Donald, W.W., Nelson, K. 2006. Practical changes to single-boom sprayers for zone herbicide application. Weed Technology. 20(2):502-510. Donald, W.W., Hoerauf, R.A. 2006. Enhanced germination and emergence of dormant wild mustard (Sinapsis arvensis) seed by two substituted phthalimides. Weed Science. 33(6): 894-902. Jang, G., Sudduth, K.A., Hong, S.Y., Kitchen, N.R., Palm, H.L. 2005. Relating image-derived vegetation indices to crop yield. In: Yang, C., Everitt, J.H. (editors), Proc. 20th Biennial Workshop on Aerial Photography, Videography, and High Resolution Digital Imagery for Resource Assessment. Weslaco, TX, October 4-6, 2005. American Society for Photogrammetry and Remote Sensing, Bethesda, MD. CDROM. Jang, G., Sudduth, K.A., Hong, S.Y., Kitchen, N.R., Palm, H.L. 2006. Relating hyperspectral image bands and vegetation indices to corn and soybean yield. Korean J. of Remote Sensing. 22(3):183-197. Jung, W., Kitchen, N.R., Sudduth, K.A. 2006. Relationship of soil profile strength and apparent soil electrical conductivity to crop yield. Korean J. of Soil Science and Fertilizer. 32(2):109-115.

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Jung, W.K., Kitchen, N.R., Sudduth, K.A., Anderson, S.H. 2006. Spatial characteristics of claypan soil properties in an agricultural field. Soil Science Society of America J. 70(4):1387-1397. Kim, H.J., Hummel, J.W., Birrell, S.J. 2006. Evaluation of nitrate and potassium ion-selective membranes for soil macronutrient sensing. Transactions of the ASABE. 49(3):597-606. Kim, H.J., Sudduth, K.A., Hummel, J.W. 2006. Sensing nitrate and potassium ions in soil extracts using ion-selective electrodes. J. of Biosystems Engineering. 31(6):463-473. Kremer, R.J. 2006. Applications of soil and rhizosphere microorganisms in sustainable weed management. In: Singh, H.P., Batish, D.R., Kohli, R.K. (editors). Handbook of Sustainable Weed Management. Binghamton, NY: Food Products Press. p. 433-548. Kremer, R.J., Caesar, A.J., Souissi, T. 2006. Soilborne microorganisms of Euphorbia are potential biological control agents of the invasive weed leafy spurge. Appl. Soil Ecol. 32(1):27-37. Kremer, R.J., Means, N.E. 2006. Rhizosphere ecology and glyphosate-resistant soybean. Glyphosate and Potassium Nutrition Symposium, N. Lorenz and R.P. Dick (ed.). p.12-29. Li, J., Kremer, R.J. 2006. Growth response of weed and crop seedlings to deleterious rhizobacteria. Biological Control. 39:58-65. Marsh, L.E., Baptiste, R., Marsh, D.B., Trinklein, D., Kremer, R.J. 2006. Temperature effects on bradyrhizobium spp. growth and symbiotic effectiveness with pigeonpea and cowpea. J. of Plant Nutrition. 29(3):331-346. Martin, N., Bollero, G.A., Kitchen, N.R., Kravchenko, A.N., Sudduth, K.A., Wiebold, W.J., Bullock, D.G. 2006. Two classification methods for developing and interpreting productivity zones using site properties. Plant and Soil. 288(1-2):357-371. Massey, J.H., Smith, M.C., Johnson, A., Thomas, J., Tacker, P.L., Vories, E.D., Lancaster, S., Andrews, A.A., Ampim, P. 2006. Multiple-inlet plus intermittent rice irrigation increases rainfall capture and reduces non-point source runoff. Proc. 31st Rich Technical Working Group. p.135 CDROM Mungai, N.W., Motavalli, P.P., Kremer, R.J. 2006. Soil organic carbon and nitrogen fractions in temperate alley cropping systems. Communications in Soil Science and Plant Analysis. 37:977-992. Mungai, N.W., Motavalli, P.P., Nelson, K.A., Kremer, R.J. 2006. Differences in yields, residue composition, and N mineralization dynamics of Bt and non-Bt maize. Nutrient Cycling in Agroecosystems. 73(1):101-109. Roberts, D.R., Kitchen, N.R., Scharf, P.C., Sudduth, K.A. 2006. An environmental assessment of sensor-based variable-rate nitrogen management in corn. North Central Extension Industry Soil Fertility Conference, Nov. 7-8, 2006, Des Moines, IA. Sadler, E.J., Bausch, W.C., Fausey, N.R., Ferguson, R.B. 2006. Improving water use efficiency in agriculture. In: Proc. International Fertilizer Industry Association (IFA)/Chinese National Chemical Construction Corporation (CNCCC) Agriculture Conference, Optimizing Resource Use Efficiency for Sustainable Intensification of Agriculture. February 27-March 2, 2006, Kunming, China. CDROM. Sadler, E.J., Lerch, R.N., Alberts, E.E., Oster, T. 2006. Long-term hydrologic database: Goodwater Creek, Missouri. P 161-68 In. Fowler. D.L. compiler. Proc. 2nd Interagency Conference on Research in the Watersheds, May 16-17, 2006. Coweeta Hydrologic Laboratory, Otto, NC. Scharf, P.C., Kitchen, N.R., Sudduth, K.A., Davis, J.G. 2006. Spatially variable corn yield is a weak predictor of optimal nitrogen rate. Soil Science Society of America J. 70:2154-2160.

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Smith, M.C., Massey, J.H., Johnson, A., Thomas, J., Tacker, P.L., Vories, E.D., Lancaster, S., Andrews, A., Ampim, P. 2006. Multiple-inlet plus intermittent rice irrigation reduces water use while maintaining acceptable yields. Proc. 31st Rice Technical Working Group. p. 135. CD-ROM. Souza, E.G., Scharf, P.C., Sudduth, K.A., Hipple, J.D. 2006. Using a field radiometer to estimate instantaneous sky clearness. Brazilian J. of Agricultural and Environmental Engineering. 10(2):369-373 Sudduth, K.A., Jang, G., Lerch, R.N., Sadler, E.J. 2006. Hyperspectral reflectance estimation of reservoir water quality. In: Yang, C., Everitt, J.H. (editors), Proc. 20th Biennial Workshop on Aerial Photography, Videography, and High Resolution Digital Imagery for Resource Assessment. Weslaco, TX, October 4-6, 2005. American Society for Photogrammetry and Remote Sensing, Bethesda, MD. CDROM. Sudduth, K.A., Kitchen, N.R. 2006. Increasing information with multiple soil electrical conductivity datasets. In: ASABE Annual International Meeting Technical Papers. ASABE Annual Meeting, July 9-12, 2006, Portland, Oregon. Paper No. 061055. Vories, E.D., Teague, T., Greene, J., Stewart, J., Clawson, E., Pringle, L., Phipps, B. 2006. Determining the optimum timing for the final irrigation on mid-south cotton. National Cotton Council Beltwide Cotton Conf., January 3-6, 2006, San Antonio, Texas. CDROM. Vories, E.D., Tacker, P., Chaubey, I., Lipsey, R., Smith, W., Schaffer, B. 2006. On-farm studies of water use and water quality for rice production. 2006 EWRI World Environ. and Water Res., May 21-25, 2006, Omaha, Nebraska. CDROM. Vories, E.D., Tacker, P. 2006. Effect of et calculation method on irrigation scheduling in midsouth. ASABE Annual Intern. Meeting, Portland, OR, July 9-12, 2006. P. 062205 CDROM. Vories, E.D., Tacker, P., Chaubey, I. 2006. On-Farm Studies of Water Use and Water Quality for Rice Production in the USA. Proc. An International Perspective on Environmental and Water Resources. Dec 18-20, New Delhi, India. CDROM. Yildirim, S., Birrell, S.J., Hummel, J.W. 2006. Laboratory evaluation of an electro-pneumatic sampling method for real-time soil sensing. Transactions of the ASABE. 49(4):845-850.

2005

Busscher, W.J., Bauer, P.J., Sadler, E.J. 2005. Infiltration and evapotranspiration for cotton grown with reduced tillage on goldsboro loamy sand. Proc. of the Southern Conservation Tillage Systems Conference, June 27-29, Florence, SC. p. 217-221. Chung, S., Sudduth, K.A. 2005. Development and evaluation of a horizontally operating soil strength profile sensor. In: Proc. of the First Asian Conference on Precision Agriculture, August 4-6, 2005, Toyohashi, Japan. p. 101-106. CDROM. Chung, S., Sudduth, K.A., Chang, Y. 2005. Path analysis of factors limiting crop yield in rice paddy and upland corn fields. J. of Biosystems Engineering. 30(1):45-55. Drummond, S.T., Sudduth, K.A. 2005. Analysis of errors affecting yield map accuracy. In: Mulla, D.J., editor. Proc. of the 7th International Conference on Precision Agriculture, July 25-28, 2004. Precision Agriculture Center, University of Minnesota, St. Paul, MN. CDROM. Edwards, J.T., Purcell, L.C., Vories, E.D. 2005. Light interception and yield potential of short-season maize (Zea mays L.) hybrids in the midsouth. Agronomy J. 97(1):225-234. Fang, M., Kremer, R.J., Motavalli, P.P., Davis, G. 2005. Bacterial diversity of rhizospheres of nontransgenic and transgenic corn. Applied and Environmental Microbiology. 71(7):4132-4136.

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Ghidey, F., Blanchard, P.E., Lerch, R.N., Kitchen, N.R., Alberts, E.E., Sadler, E.J. 2005. Measurement and simulation of herbicide transport from the corn phase of three cropping systems. J of Soil and Water Conservation. 60(5):260-272. Jung, W., Kitchen, N.R. 2005. Site-specific soil quality management. In: Eco-Friendly Precision Agriculture Research. Proc. of the 2005 Meeting of the Korean Society of Precision Agriculture, June 22, 2005. Korean Society of Precision Agriculture, Suwon, Korea. p. 91-107. Jung, W.K., Kitchen, N.R., Sudduth, K.A., Kremer, R.J., Motavalli, P.P. 2005. Relationship of apparent soil electrical conductivity to claypan soil properties. Soil Science Society of America J. 69:883-892. Kim, H., Hummel, J.W., Birrell, S.J., Sudduth, K.A. 2005. Evaluation of phosphate ion-selective membranes for real-time soil nutrient sensing. American Society of Agricultural Engineers Annual International Meeting. Paper No. 051033. CDROM. Kim, S.J., Kremer, R.J. 2005. Scanning and transmission electron microscopy of root colonization of morningglory (Ipomoea spp) seedlings by rhizobacteria. Symbiosis. 39:117-124. Kitchen, N.R., Sudduth, K.A., Myers, B.D., Drummond, S.T., Hong, S.Y. 2005. Delineating productivity zones on claypan soil fields using apparent soil electrical conductivity. Computers and Electronics in Agriculture. 46:285-308. Kitchen, N.R., Sudduth, K.A., Myers, D.B., Massey, R.E., Sadler, E.J., Lerch, R.N., Hummel, J.W., Palm, H.L. 2005. Development of a conservation-oriented precision agriculture system: crop production assessment and plan implementation. J. of Soil and Water Conservation. 60(6)421-430. Kremer, R.J., Means, N.E., Kim, S. 2005. Glyphosate affects soybean root exudation and rhizosphere microorganisms. International J. of Analytical Environmental Chemistry. 85(15):1165-1174. Kremer, R.J., Means, N.E. 2005. Herbicidal impacts on crop-soil microbial interactions and potential plant disease. In: Yamada, T., editor. Proc. of Symposium on Mineral Nutrition and Plant Disease Incidence. POTAFOS, Piracicaba-SP, Brazil. CDROM. Kremer, R.J. 2005. The role of bioherbicides in weed management. Biopesticides International. 1:127-141. Lerch, R.N., Kitchen, N.R., Kremer, R.J., Donald, W.W., Alberts, E.E., Sadler, E.J., Sudduth, K.A., Myers, D.B., Ghidey, F. 2005. Development of a conservation-oriented precision agriculture system: water and soil quality assessment. J. of Soil and Water Conservation. 60(6):411-421. Lerch, R.N., Wicks, C.M., Moss, P.L. 2005. Hydrologic characterization of two karst recharge areas in Boone County, Missouri. J. of Cave and Karst Studies. 67(3):158-173. Massey, R.E., Kitchen, N.R., Myers, D.B., Sudduth, K.A., Drummond, S.T. 2005. Site-specific profitability methods, analysis, and decisions. In: Mulla, D.J., editor. Proc. of the 7th International Conference on Precision Agriculture, July 25-28, 2004. Precision Agriculture Center, University of Minnesota, St. Paul, MN. CDROM. Means, N.E., Starbuck, C.J., Kremer, R.J., Jett, L.W. 2005. Effects of a food waste-based soil conditioner on soil properties and plant growth. Compost Science and Utilization. 13(2):116-121. Mungai, N.W., Motavalli, P.P., Kremer, R.J., Nelson, K.A., 2005. Spatial variation of soil enzyme activities and microbial functional diversity in temperate alley cropping systems. Biology and Fertility of Soils. 42(2):129-136. Oueslati, O., Ben-Hammouda, M., Ghorbal, M.H., Guezzah, M., Kremer, R.J. 2005. Barley autotoxicity as influenced by varietal and seasonal variation. J of Agronomy and Crop Science. 191(4):249-254.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Pengthamkeerati, P., Motavalli, P.P., Kremer, R.J., Anderson, S.H. 2005. Soil carbon dioxide efflux in a claypan soil affected by surface compaction and applications of poultry litter. Agricultural Ecosystems and Environment. 109(1-2):75-86. Sadler, E.J., Evans, R.G., Stone, K.C., Camp, C.R. 2005. Opportunities for conservation with precision irrigation. J. of Soil and Water Conservation. 60(6):371-379. Sadler, E.J., Sudduth, K.A., Kitchen, N.R., Lerch, R.N., Kremer, R.J., Vories, E.D. 2005. Newly developed technologies for soil and water conservation. In: Chung, N.J., Kim, W.S., Kim, H.S., Kim, J.K., Eom, K.C., Lee, I.W., (editors). Proc. of the International Workshop on Newly Developed Innovative Technology for Soil and Water Conservation. Rural Development Administration, Suwon, Korea. p. 15-34. Sadler, E.J., Sudduth, K.A., Kitchen, N.R., Lerch, R.N., Kremer, R.J., Vories, E.D. 2005. Newly Developed Technologies for Soil and Water Conservation, Extension 567, Food & Fertilizer Technology Center, P.O. Box 22-149 Taipei 106, Taiwan ROC. 2005. Scharf, P.C., Kitchen, N.R., Sudduth, K.A., Davis, J.G., Hubbard, V.C., Lory, J.A. 2005. Field-scale variability in economically-optimal nitrogen fertilizer rate for corn. Agronomy J. 97(2):452-461. Shannon, D.K., Palm, H.L., Kitchen, N.R., Sudduth, K.A. 2005. Implementation and validation of sensor-based site-specific crop management through on-farm research. In: Mulla, D.J., editor. Proc. of the 7th International Conference on Precision Agriculture, July 25-28, 2004. Precision Agriculture Center, University of Minnesota, St. Paul, MN. CDROM. Sudduth, K.A., Birrell, S.J., Bollero, G.A., Bullock, D.G., Hummel, J.W., Kitchen, N.R. 2005. Site-specific relationships between corn population and yield. In: Mulla, D.J., editor. Proc. of the 7th International Conference on Precision Agriculture, July 25-28, 2004. Precision Agriculture Center, University of Minnesota, St. Paul, MN. CDROM. Sudduth, K.A., Chung, S. 2005. The compaction problem: sensors address soil compaction variations. Resource. 12(4):9-10. Sudduth, K.A., Kitchen, N.R., Wiebold, W.J., Batchelor, W.D., Bollero, G.A., Bullock, D.G., Clay, D.E., Palm, H.L., Pierce, F.J., Schuler, R.T., Thelen, K.D. 2005. Relating apparent electrical conductivity to soil properties across the north-central USA. Computers and Electronics in Agriculture. 46:263-283. Vories, E.D., Tacker, P.L., Hogan, R. 2005. Multiple inlet approach to reduce water requirements for rice production. Applied Engineering in Agriculture. 21(4):611-616. Edwards, J.T., Purcell, L C., Vories, E.D. 2005. Light interception and yield potential of short-season maize (Zea mays L.) hybrids in the Midsouth. Agron. J. 97(1):225–234. Zdor, R.E., Alexander, C.M., Kremer, R.J. 2005. Weed suppression by deleterious rhizobacteria is affected by formulation and soil properties. Communications in Soil Science and Plant Analysis. 36:1289-1299.

2004 Adamchuk, V.I., Hummel, J.W., Morgan, M.T., Upadhyaya, S.K. 2004. On-the-go soil sensors for precision agriculture. Comp. and Elect. in Agri. 44:71-97. Adams, B.T., Reid, J.F., Hummel, J.W., Zhang, Q., Hoeft, R.G. 2004. Effects of central tire inflation systems on ride quality of agricultural vehicles. J. of Terramechanics. 41(4):199-207. Blanco-Canqui, B., Gantzer, C.J., Anderson, S.H., Alberts, E.E. 2004. Tillage and crop influences on physical properties for an epiaqualf. Soil Sci. Soc. of America J. 68:567-576.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Blanco-Canqui, B., Gantzer, C.J., Anderson, S.H., Alberts, E.E., Thompson, A.L. 2004. Grass barrier and vegetative filter strip effectiveness in reducing runoff, sediment, nitrogen, and phosphorus losses. Soil Sci. Soc. of America J. 68:1670-1678. Blanco-Canqui, B., Gantzer, C.J., Anderson, S.H., Alberts, E.E. 2004. Grass barrier for reduced concentrated flow induced soil and nutrient loss. Soil Sci. Soc. of America J. 68:1963-1972. Caesar, A.J., Kremer, R.J. 2004. Bacterial communities associated with a flea beetle used for the biological control of the perennial weed Euphorbia esula/virgata. In: Cullen, J. M. (Ed.), Proc. of the XI International Symposium on Biological Control of Weeds, CSIRO, Canberra. pp. 493-495. Chung, S.O. 2004. On-the-go soil strength profile sensor [Ph. D. Dissertation]. Columbia, MO: University of Missouri, Columbia. p. 254. Chung, S., Sudduth, K.A. 2004. Characterization of cone index and tillage draft data to define design parameters for an on-the-go soil strength profile sensor. Agricultural and Biosystems Engineering. 5(1):10-20. Chung, S.O., Sudduth, K.A., Hummel, J.W., Motavalli, P.P., Kitchen, N.R. 2004. Empirical relationships between prismatic soil strength index and cone index. In: Proc. 2004 International Commission of Agricultural Engineering (CIGR) International Conference, October 11-14, 2004, Beijing, China. CDROM. Chung, S.O., Sudduth, K.A., Motavalli, P.P., Kitchen, N.R. 2004. Relating on-the-go soil strength data to cone index. ASAE Paper No. MC04-205, St. Joseph, MI. Chung, S.O., Sudduth, K.A., Plouffe, C., Kitchen, N.R. 2004. Evaluation of an on-the-go-soil strength profile sensor using soil bin and field data. ASAE Paper No. 041039. CDROM. DeLuna, L.Z., Stubbs, T.L., Kennedy, A.C., Kremer, R.J. 2004. Deleterious bacteria in the rhizosphere. In: S. Wright and R.W. Zobel (eds). Roots and Soil Management-Interactions Between Roots and the Soil. ASA-CSSA-SSSA Monograph 48, Madison, WI. pp. 233-261. Donald, W.W., Johnson, W.G., Nelson, K. 2004. In-row and between-row interference by corn modifies annual weed control by preemergence residual herbicide. Weed Technol. 18:497-504. Donald, W.W., Archer, D., Johnson, W.G., Nelson, K. 2004. Zone herbicide application controls annual weeds and reduces residual herbicide use in corn. Weed Sci. 52:821-833. Fridgen, J.L., Kitchen, N.R., Sudduth, K.A., Drummond, S.T., Wiebold, W.J., Fraisse, C.W. 2004. Management zone analyst (MZA): software for sub-field management zone delineation. Agronomy J. 96:100-108. Hong, S.Y., Sudduth, K.A., Kitchen, N.R., Fraisse, C.W., Palm, H.L., Wiebold, W.J. 2004. Comparison of remote sensing and crop growth models for estimating within-field LAI variability. Korean J. of Remote Sensing. 20(3):175-188. Hong, S.Y., Sudduth, K.A., Kitchen, N.R., Wiebold, W.J., Palm, H.L., Rim, S.K., Sonn, Y.K., Kwak, H.K. 2004. Remote sensing of soils: using airborne hyperspectral images to estimate within-field variations in soil properties. In: Proc. Global Digital Soil Mapping Workshop, September 14-17, 2004, Montpellier, France. CD-ROM. Hummel, J.W., Ahmad, I.S., Newman, S.C., Sudduth, K.A., Drummond, S.T. 2004. Simultaneous soil moisture and cone index measurement. Trans. ASAE. 47(3):607-618. Hummel, J.W., Birrell, S.J., Price, R.R., Kim, H., Yildirim, S. 2004. Development of components of a real-time soil macronutrient sensor. In: Proc. 2004 International Commission of Agricultural Engineering (CIGR) International Conference, October 11-14, 2004, Beijing, China. CD-ROM.

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Kremer, R.J. 2004. Weed control. In: C. W. Smith, J. Betran, and E.C.A. Runge (ed.) Corn: Origin, History, Technology, and Production, John Wiley & Sons, NY. pp. 717-752 Kremer, R.J., Motavalli, P.P. 2004. Environmental impacts of transgenic crops: introduction J. Environ. Qual. 33(3):805. Kremer, R.J., Park, K. 2004. Soil amendment with organic materials for improved soil quality. Proc. of the Sustainable Land Application Conf. January 4-8, 2004. Lake Buena Vista, Florida. p. 72. Lin, C.Y., Lerch, R.N., Garrett, H.E., George, M.F. 2004. Incorporating forage grasses in riparian buffers for bioremediation of atrazine, isoxaflutole and nitrate in Missouri. Agroforestry Systems. 63:91-99. Lu, Y.C., Camp, C.R., Sadler, E.J. 2004. Efficient allocations of irrigation water and nitrogen fertilizer in corn production. J. Sustainable Agriculture. 24(4):97-111. Motavalli, P.P., Kremer, R.J., Fang, M., Means, N.E. 2004. Impact of genetically modified crops and their management on soil microbially mediated plant nutrient transformations. J. Environ. Qual. 33:816-824. Mungai, N.W., Motavalli, P.P., Kremer, R.J. 2004. Soil organic C and N fractions in long-term temperate alley cropping practices. Pp 196-205 in S.H. Sparrow (ed.) Proc. 8th North American Agroforest. Conf., Oregon State Univ., Corvallis, OR. CD-ROM. Officer, S.J., Kravchenko, A., Bollero, G.A., Sudduth, K.A., Kitchen, N.R., Wiebold, W.J., Palm, H.L., Bullock, D.G. 2004. Relationships between soil bulk electrical conductivity and the principal component analysis of topography and soil fertility values. Plant and Soil: 258:269-280. Poach, M.E., Hunt, P.G., Reddy, G.B., Stone, K.C., Matheny, T.A., Johnson, M.H., Sadler, E.J. 2004. Ammonia volatilization from marsh-pond-marsh constructed wetlands treating swine wastewater. J. of Environmental Quality. 33(3):844-851. Rachman, A., Anderson, S.H., Gantzer, C.J., Alberts, E.E. 2004. Soil hydraulic properties influenced by stiff-stemmed grass hedge systems. Soil Sci. Soc. Am. J. 68:1386-1393. Sudduth, K.A., Hummel, J.W., Drummond, S.T. 2004. Comparison of the Veris Profiler 3000 to an ASAE-standard penetrometer. Applied Engineering in Agriculture. 20(5):535-541. Sudduth, K.A., Kitchen, N.R. 2004. Mapping soil electrical conductivity. In: Stamatiadis, S., Lynch, J.M., Schepers, J.S. (editors). Remote Sensing for Agriculture and the Environment. Peripheral Editions, Larissa, Greece. p. 188-201. Sung, J.H., Jung, I.G., Lee, C.K., Lee, Y.B., Choi, K.M., Suh, S.R., Sudduth, K.A. 2004. Object oriented field information management (FIM) program developed for precision agriculture. ASAE Mid-Central Conference. Paper No. MC04-204. Zablotowicz, R.M., Locke, M.A., Lerch, R.N., Knight, S.S. 2004. Dynamics of herbicide concentrations in Mississippi delta oxbow lakes and the role of planktonic microorganisms in herbicide metabolism. American Chemical Society Symposium Series 877. In: Nett, Mary T., Locke, Martin, A., and Pennington, Dean A., (editors). Water Quality Assessments in the Mississippi Delta. Oxford University Press, New York, NY. pp. 134-149.

2003 Alberts, E.E., Jaynes, D.B., Lerch, R.N. 2003. Nutrient and herbicide movement in streamflow from two midwestern watersheds. Proc. of the First Interagency Conf. on Research in the Watersheds. pp.385-390. USDA/ARS. CD-ROM.

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Alberts, E.E., Ghidey, F., Kramer, L.A. 2003. Impact of grass hedges on sediment yield from a HEL watershed. Proc. of the First Interagency Conf. on Research in the Watersheds. pp. 428-433. USDA/ARS. CD-ROM. Barnes, E.M., Sudduth, K.A., Hummel, J.W., Lesch, S.M., Cowin, D.L., Yang, C., Daughtry, C.S.T., Bausch, W.C. 2003. Remote- and ground based sensor techniques to map soil properties. Photogrammetric Engineering and Remote Sensing. 69:619-630. Bockhold, D.L., Thompson, A.L., Sudduth, K.A., Henggeler, J.C. 2003. Irrigation scheduling using infrared thermometers to measure canopy temperature on cotton and soybean. ASAE, St. Joseph, MI. CD-ROM Chung, S., Sudduth, K.A., Hummel, J.W. 2003. On-the-go soil strength profile sensor using a load cell array. ASAE Paper no. 031071. Chung, S., Sudduth, K.A., Drummond, S.T. 2003. Determining yield monitoring system delay time with geostatistical and data segmentation approaches. Trans. of the ASAE. 45(4):915-926. Chung, S., Sudduth, K.A. 2003. Characterization of soil strength data for an on-the-go sensor. American Soc. of Agricultural Engineering Meetings Papers. Mid-Central Conf. Paper MC03-203. Chung, S., Sudduth, K.A. 2003. Modeling soil failure caused by prismatic and conical tools. American Soc. of Agri. Eng. Annual Inter Natl. Mtg. Technical Papers. Paper no. 031028. CD-ROM. Davis, J.G., Scharf, P.C., Kitchen, N.R. 2003. Site-specific nitrogen management for reducing soil residual nitrate. Proc. North Central Extension Industry Soil Fertility Conference. p. 76-86. Donald, W.W., Johnson, W.G. 2003. Interference effects of weed-infested bands in or between crop rows on field corn (Zea Mays) yield. Weed Technol. 17:755-763. Drummond, S.T., Sudduth, K.A., Joshi, A., Birrell, S.J., Kitchen, N.R. 2003. Statistical and neural methods for site-specific yield prediction. Trans. ASAE. 46:5-14 Kim, H., Hummel, J.W., Birrell, S. 2003. Evaluation of ion-selective membranes for real-time soil nutrient sensing. ASAE. Paper no. 031075. Kitchen, N.R., Drummond, S.T., Lund, E.D., Sudduth, K.A., Buchleiter, G.W. 2003. Soil electrical conductivity and topography related to yield for three contrasting soil-crop systems. Agronomy J. 95:483-495. Kitchen, N.R., Sudduth, K.A., Myers, D.B., Drummond, S.T., Hong, S.Y. 2003. Site-specific productivity zones delineated using bulk soil electrical conductivity. American Soc. of Agricultural Engineers Annual Internat. Meeting Technical Papers. Paper no. 032340. CD-ROM. Kremer, R.J., Li., J. 2003. Developing weed-suppressive soils through improved soil quality management. Soil Till. Res. 72:193-202. Lerch, R.N., Blanchard, P.E. 2003. Watershed vulnerability to herbicide transport in northern Missouri and southern Iowa streams. Environmental Sci. & Techno. 37(24):5518-5527. Lerch, R.N., Blanchard, P.E. 2003. Herbicide contamination and transport in northern Missouri and southern Iowa streams. Proc. First Interagency Conference on Research in the Watersheds. United States Department of Agriculture. Agricultural Research Service. Washington, D.C. p. 588-594. Lerch, R.N., Ferrer, I., Thurman, E.M., Zablotowicz, R.M. 2003. Identification of trifluralin metabolites in soil using ion-trap LC/MS/MS. American Chemical Soc. Symposium series 850; Ch. 17. Liquid chromatography/mass spectrometry, MS/MS and time-of-flight MS. pp. 291-310.

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Lin, C.H., Lerch, R.N., Garrett, H.E., Johnson, W.G., Jordan, D., George, M.F. 2003. The effect of five forage species on transport and transformation of atrazine and isoxaflutole (Balance) in lysimeter leachate. J. of Environ Quality. 32:1992-2000. Lin, C.H., Lerch, R.N., Garrett, H.E., George, M.F. 2003. Degradation of isoxaflutole (Balance) herbicide by hypochlorite in tap water. J. of Agri. and Food Chem. 51:8011-8014. Moran, S., Fitzgerald, G., Rango, A., Walthall, C., Barnes, E., Clarke, T., Daughtry, C., Everitt, J., Escobar, D., Hatfield, J., Havstad, K.M., Jackson, T.J., Kitchen, N.R., Kustas, W.P., McGuire, M.R., Pinter Jr, P.J., Sudduth, K.A., Schepers, J.S., Schmugge, T.J., Starks, P.J., Upchurch, D. 2003. Sensor development and radiometric correction for agricultural applications. J. of Photogrammetric Engineering and Remote Sensing. 69(6):705-718. Myers, D.B., Kitchen, N.R., Sudduth, K.A. 2003. Assessing spatial and temporal nutrient dynamics with a proposed nutrient buffering index. Proc. North Central Extension Industry Soil Fertility Conf. p. 190-199. Price, R.R., Hummel, J.W., Birrell, S.J., Ahmad, I.S. 2003. Rapid nitrate analysis of soil cores using ISFETs. Trans. ASAE. 46(3):601-610. Scharf, P.C., Schmidt, J.P., Kitchen, N.R., Sudduth, K.A., Hong, S.Y., Lory, J.A., Davis, J.G. 2003. Remote sensing for nitrogen management. J. of Soil and Water Conservation. 57(6): 518-524. Sudduth, K.A., Kitchen, N.R., Bollero, G.A., Bullock, D.G. 2003. Comparison of electromagnetic induction and direct sensing of soil electrical conductivity. Agronomy J. 95:472-482. Sudduth, K.A., Hong, S., Hummel, J.W., Kitchen, N.R. 2003. Reflectance measurements of soil variability. Proc. 24th Asian Conference on Remote Sensing and 2003 International Symposium on Remote Sensing. Busan, South Korea. CD-ROM. Wang, D., Prato, T., Qiu, Z., Kitchen, N.R., Sudduth, K.A. 2003. Economic and environmental evaluation of variable rate nitrogen and lime application for claypan soil fields. Precision Agri. 4:35-52. Wang, F., Fraisse, C., Kitchen, N.R., Sudduth, K.A. 2003. Site-specific evaluation of the CROPGRO-soybean model on Missouri claypan soils. Agri. Systems. 766:985-1005. Yildirim, S., Birrell, S.J., Hummel, J.W. 2003. Development of a real-time electropneumatic soil sampler. Proc. Internat. Congress on Information Technology in Agri., Food and Environ. Izmir, Turkey. p. 393.

2002 Anderson, R., Zakarison, E., Ball, D., Wicks, G., Lyon, D., Donald, W., Miller, S., Young, F., White, T. 2002. Jointed Goatgrass Ecology BulletIn. EB 1932. Cooperative Extension, Washington State Univ., Pullman, WA. P. 8. Adams, B.T., Reid, J.F., Hummel, J.W., Zing, Q. Hoeft, R.G. 2002. Impact of a central tire inflation system on traction and compaction of agricultural vehicles. ASAE. Paper No. 021122. St. Joseph, MI. Ben-Hammouda, M., Ghorbal, H., Kremer, R.J., Oueslatt, O. 2002. Autotoxicity of barley. J of Plant Nutrition. 25:1155-1161. Blanco-Canqui, H., Gantzer, C.J., Anderson, S.H., Alberts, E.E., Ghidey, F. 2002. Saturated hydraulic conductivity and its impact on simulated runoff for claypan soils. Soil Sci. Soc. of American J. 66:1596-1602. Chung, S.O., Sudduth, K.A., Drummond, S.T. 2002. Determining yield monitoring system delay time with geostatistical and data segmentation approaches. Trans. ASAE. 45(4):915-926. Clay, D.E., Kitchen, N.R, Sudduth, K.A., Carlson, C.G., Kleinjan, J.L., Tjentland, W.A. 2002. Collecting representative soil samples for N and P fertilizer recommendations. Crop Management.

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Devaney, P.M., Thompson, A.L., Ghidey, F., Alberts, E.E. 2002. Influence of application method on polyacrylamide effectiveness for erosion control. ASAE, St. Joseph, MI. Paper No. 022080, Donald, W.W. 2002. Glyphosate effects of ground cover of tall fescue (Festuca arundinaceae) waterways and estimated soil erosion. J of Soil and Water Conservation. 57:237-243. Drummond, S.T., Sudduth, K.A., Kitchen, N.R., Batchelor, W.D., Bollero, G.A., Bullock, D.G., Clay, D.E., Palm, H.L., Wiebold, W.J., Pierce, F.J. 2002. Neural network analysis of site-specific soil. Landscape and Yield Data. Proc. 6th Internat. Conf. on Precision Agriculture. American Soc. of Agronomy. Madison, WI. CD-ROM. Ghidey, F., Alberts, E.E., Lerch, R.N. 2002. Evaluation of herbicide losses from three field-size watersheds. Trans. ASAE Meeting, St. Joseph, MI. Paper no. 022142. Hatfield, J.L., Bucks, D.A., Alberts, E.E., Dowdy, R.H., Fausey, N.R., Schepers, J.S. 2002. Assessment of the water quality impacts of farming systems by integrating databases and simulation models. Natl. Water Quality Monitoring Council. Madison, WI. CD-ROM. Hong, S.Y., Sudduth, K.A., Kitchen, N.R., Palm, H.L., Wiebold, W.J. 2002. Using airborne hyperspectral and satellite multispectral data to quantify within-field spatial variability. Korean J. of Precision Agri. 1(1):82-98. Hong, S.Y., Sudduth, K.A., Kitchen, N.R., Drummond, S.T., Palm, H.L., Wiebold, W.J. 2002. Estimating within-field variations in soil properties from airborne hyperspectral images. Proc. Pecora 15/Land Satellite Info. 4th Conf. CD-ROM. American Soc. for Photogrammetry and Remote Sensing, Bethesda, MD. Hong, S.Y., Sudduth, K.A., Kitchen, N.R., Fraisse, C.W., Palm, H.L., Wiebold, W.J. 2002. Combining remote sensing and crop growth models to estimate within-field variability. Proc. 6th Internat. Conf. on Precision Agri. American Soc. of Agronomy. Madison, WI. CD-ROM. Hummel, J.W., Drummond, S.T., Sudduth, K.A., Krumpelman, M.J. 2002. Sensing systems for site-specific assessment of corn plants. Proc. 6th Internat. Conf. on Precision Agri. American Soc. of Agronomy. Madison, WI. CD-ROM. Hummel, J.W., Stoller, E.W. 2002. On-the-go weed sensing and herbicide application for the northern cornbelt. ASAE, St. Joseph, MI. Paper No. 021021. Kitchen, N.R., Fridgen, J.J., Sudduth, K.A., Drummond, S.T., Wiebold, W.J., Fraisse, C.W. 2002. Proc. for evaluating unsupervised classification to derive management zones. Proc. 6th Internat. Conf. on Precision Agri. American Soc. of Agronomy, Madison, WI. CD-ROM. Kitchen, N.R., Snyder, C.J., Franzen, D.W., Wiebold, W.J. 2002. Educational needs of precision agriculture. Precision Agri. 3:341-351. Kitchen, N.R., Sudduth, K.A. 2002. What is the best method for relating mapped yield data with other data? Proc. of 5th Natl. Conservation Tillage Cotton and Rice Conf. Tillage Digest. p. 56-57 Kitchen, N.R., Sudduth, K.A., Hong, S.Y. 2002. Before you variably apply, understand why: lessons from Missouri precision agriculture research. In Proc. of Korean Annual Conf. on Precision Agri., Suwon, Korea, Sept. 14, 2002, Nat. Agric. Mech. Res. Institute, RDA, Suwon, Korea. p. 45-66 Kremer, R.J. 2002. Bioherbicides - potential successful strategies for weed control. In: O. Koul and G. Dhaliwal (editors) Microbial Biopesticides, Taylor & Francis, London. pp. 307-323 Kramer, L.A., Alberts, E.E. 2002. Using grass hedges for erosion control. Proc. of the Internat. Erosion Control Assoc. Steamboat Springs, CO. pp. 629-632.

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Li, J., Kremer, R.J., Ross Jr., L.M. 2002. Electron microscopy of root colonization of Setaria viridis by deleterious rhizobacteria as affected by soil properties. Symbiosis. 32:1-13. Lin, C.H., Lerch, R.N., Thurman, E.M., Garrett, H.E., George, M.F. 2002. Determination of isoxaflutole (balance) and its metabolites in water using solid phase extraction followed by high performance liquid chromatography with ultraviolet or mass spectrometery. J. of Agri. and Food Chemistry. 50: 5816-5824. Myers, D.B., Kitchen, N.R., Sudduth, K.A., Fraisse, C.W. 2002. Landform, soil morphology, and tillage effects on soybean root distribution for claypan soils. Proc. 6th Internat. Conf. on Precision Agriculture. American Soc. of Agronomy, Madison, WI. CD-ROM. Palm, H.L., Wiebold, W.J., Kitchen, N.R., Sudduth, K.A., Batchelor, W.D., Clay, D.E., Pierce, F.J., Schuler, R.T., Thelen, K.D. 2002. The zones projects: understanding soybean yield variability. Proc. 6th Internat. Conf. on Precision Agriculture. American Soc. of Agronomy. Madison, WI. CD-ROM. Renschler, C.S., Flanagan, D.C., Engel, B.A., Kramer, L.A., Sudduth, K.A. 2002. Site-specific decision-making based on RTK GPS survey and six alternative elevation data sources: watershed topography and delineation. Trans. ASAE. 45(6):1883-1895. Scharf, P.C., Kitchen, N.R., Sudduth, K.A., Daivs, J.G., Lory, J. 2002. Field-scale evaluation of variable N rate recommendations for corn. Proc. 6th Inter Natl. Conf. on Precision Agriculture. American Soc. of Agronomy. Madison, WI. CD-ROM. Scharf, P.C., Schmidt, J.P., Kitchen, N.R., Sudduth, K.A., Hong, S.Y., Lory, J.A., Davis, J.G. 2002. Remote sensing for nitrogen management. J of Soil and Water Conservation 57(6):518-524. Shannon, D.K., Davis, J.G., Sudduth, K.A., Wiebold, W.J. 2002. Precision agriculture masters program - educating Missouri crop producers about the benefits of precision agriculture management through on-farm research. ASAE. Paper no. 021016. Sudduth, K.A. 2002. Are you monitoring in-field yield variation this year? Today’s Farmer Magazine. 93(7):18-19. Sudduth, K.A. 2002. Precision agriculture data acquisition, analysis, and interpretation: a Missouri perspective. Proc. of Third Internat. Seminar on Data Collection and Analysis of the Field Information for Precision Agriculture. Rural Development Administration. Suwon, Republic of Korea. p. 45-86. Sudduth, K.A., Kitchen, N.R., Batchelor, W.D., Bollero, G.A., Bullock, D.G., Clay, D.E., Palm, H.L., Wiebold, W.J., Pierce, F.J., Schuler, R.T. 2002. Characterizing field-scale soil variability across the Midwest with soil electrical conductivity. Proc. 6th Internat. Conf. on Precision Agriculture. American Soc. of Agronomy. Madison, WI. CD-ROM. Swisher, D.W., Borgelt, S.C., Sudduth, K.A. 2002. Optical sensor for granular fertilizer flow rate measurement. Trans. ASAE., St. Joseph, MI. 45(4):881-888. Williams, J. 2002. Determining spatially variable corn nitrogen needs using 35mm aerial photography. M.S. Thesis. Univ. of Missouri. p. 126. Wrather, J.A., Stevens, W.E., Kirkpatrick, T.L., Kitchen, N.R. 2002. Effects of site-specific application of aldicarb on cotton in a Meloidogyne incognita infested field. J of Nematology. 34:115-119.

2001 Alberts, E.E., Kramer, L.A., Ghidey, F. 2001. Sediment deposition within a watershed with stiff-stemmed grass hedges. Proc. of the Intern. Symposium on Soil Erosion for the 21st Century. Trans. ASAE, St. Joseph, MI. pp. 167-170.

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Ben-Hammouda, M., Ghorbal, H., Kremer, R.J., Ouslati, O. 2001. Allelopathic effects of barley extracts on germination and seedlings growth of bread and durum wheats. Agronomy. 21:65-71. Birrell, S.J., Hummel, J.W. 2001. Real-Time multi ISFET/FIA soil analysis system with automatic sample extraction. Computers and Electronics in Agriculture. 32(1):45-67. Chung, S.O., Sudduth, K.A., Drummond, S.T. 2001. Geostatistical and data segmentation approaches for determining yield monitoring system delay time. ASAE, St. Joseph, MI. Paper No. 011188. Donald, W.W., Kitchen, N.R., Sudduth, K.A. 2001. Between-row mowing + banded herbicide to control annual weeds and reduce herbicide use in no-till soybean (Glycine max) and corn (Zea mays). Weed Technology. 15:576-584. Fraisse, C.W., Sudduth, K.A., Kitchen, N.R. 2001. Delineation of site-specific management zones by unsupervised classification of topographic attributes and soil electrical conductivity. Trans. ASAE. 44(1):155-166. Fraisse, C.W., Sudduth, K.A., Kitchen, N.R. 2001. Calibration of the CERES-maize model for simulating site-specific crop development and yield on claypan soils. Appl. Eng. Agric. 17(4):547-556. Ghidey, F., Alberts, E.E., Kramer, L.A. 2001. Comparison of measured and WEPP predicted runoff and sediment losses from deep loess soils watershed. Proc. of the Intl Symposium on Soil Erosion for the 21st Century. pp. 131-134. Ghidey, F., Alberts, E.E., Kramer, L.A. 2001. Erosion control with stiff-stemmed grass hedges on a field watershed. ASAE. St. Joseph, MI. Paper No. 01258. Gomez, J.A., Nearing, M.A., Alberts, E.E. 2001. Analysis of sources of variability in runoff plots studies using a numerical model: A case study from a 40 fallow plots experiment. Proc. of the Intern. Symposium of Soil Erosion for the 21st Century. pp. 318-321. Gomez, J.A., Nearing, M.A., Giraldez, J.V., Alberts, E.E. 2001. Analysis of sources of variability of runoff volume in a 40 plot experiment using a numerical model. J of Hydrology. 248(2):183-197. Hummel, J.W., Sudduth, K.A., Hollinger, S.E. 2001. Soil moisture and organic matter prediction of surface and subsurface soils using an NIR soil sensor. Computers and Electronics in Agriculture. 32:149-165. Kitchen, N.R., Sudduth, K.A. 2001. Using soil electrical conductivity in precision agriculture. Proc. of 4th Natl. Conservation Tillage Cotton and Rice Conf. pp. 54-55. Kitchen, N.R., Goulding, K.W. 2001. On-farm technologies and practices to improve nitrogen use efficiency. In: Follett, R. F., Hatfield, J.L. editors. Nitrogen in the environment: sources, problems, and management. Amsterdam, the Netherlands. Elsevier Science. p. 335-369. Kremer, R.J., Souissi, T. 2001. Cyanide production by rhizobacteria and potential for suppression of weed seedling growth. Current Microbiology. 43(3):182-186. Lerch, R.N., Li, Y.X. 2001. Analysis of hydroxylated atrazine degradation products in soils. International J. of Environmental Analytical Chemistry. 79(3):167-183. Runes, H.B., Bottomley, P.J., Lerch, R.N., Jenkins, J.J. 2001. Atrazine remediation in wetland microcosms. Environmental Toxicology and Chemistry. 20(5):1059-1066. Stecker, J.A., Brown, J.R., Kitchen, N.R. 2001. Residual phosphorus distribution and sorption in starter fertilizer bands applied in no-till culture. Soil Sci. Soc. of America J. 65(4):1173-1183.

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Sudduth, K.A., Drummond, S.T., Kitchen, N.R. 2001. Accuracy issues in electromagnetic induction sensing of soil electrical conductivity for precision agriculture. Computers and Electronics in Agriculture. 31(3):239-264. Thompson, A.L., Ghidey, F., Alberts, E.E. 2001. Effect of polyacrylimide on erosion for various rainfall kinetic energies. Trans. ASAE. St. Joseph, MI. Paper No. 01253. Woodward W., Bburek, W.J., Hjelmfelt, A.T., Kluth, A.T., Plummer, R., VanMullen, A., Hailey, J. 2001. Streamflow data. Hydrology Natl. Engineering Handbook Part 630.

2000 Ahmad, I.S., Hummel, J.W., Sudduth, K.A., Drummond, S.T. 2000. Soil characterization using a nearinfrared penetrometer. Proc. of the Fifth Intern. Conf. of Precision Agriculture. Madison, WI. ASA-CSSA-SSSA. CD-ROM. Allen, J.R., Hohnson, W.G., Smeda, R.J., Kremer, R.J. 2000. ALS-resistant Helianthus annuus interference in Gylcine max. Weed Sci. 48:461-466. Bauer, M.G., Davis, J.G., Sudduth, K.A., Drummond, S.T. 2000. Agronomic evaluation of variable-rate seeding on Missouri soils. Proc. of the Fifth Intern. Conf. on Precision Agriculture. Madison, WI.: ASA-CSSA-SSSA. CD-ROM. Blanchard, P.E., Lerch, R.N. 2000. Watershed Vulnerability to losses of agricultural chemicals: Interactions of chemistry, hydrology, and land-use. Environmental Science Technology. 34(16):3315-3322. Chung, S.O., Jung, J.H., Sudduth, K.A., Drummond, S.T., Hyun, B.K. 2000. Spatial variability of yield, chlorophyll content, and soil properties in a Korean rice paddy field. Proc. of the Fifth Intern. Conf. on Precision Agriculture. Madison, WI.: ASA-CSSA-SSSA. CD-ROM. Doerge, T.A., Kitchen, N.R., Lund, E.D. 2000. Electrical conductivity mapping. Site-Specific Management Guidelines. Potash and Phosphate Institute SSMG-30. Donald, W.W. 2000. Between-row mowing + in-row band-applied herbicide for weed control in Glycine max. Weed Sci. 48:487-500. Donald, W.W. 2000. Alternative ways to control weeds between rows in weeded check plots in corn (Zea mays) and soybean (Glycine max). Weed Technol. 14:36-44. Donald, W.W. 2000. A degree-day model of Cirsium arvense shoot emergence from adventitious root buds in spring. Weed Sci. 48:333-341. Donald, W.W. 2000. Timing and frequency of between-row mowing and band-applied herbicide for annual weed control in soybean. Agron. J. 92:1013-1019. Fridgen, J.J. 2000. Development and evaluation of unsupervised clustering software for sub-field delineation of agricultural fields. M.S. Thesis. Univ. of Missouri, Columbia. Fridgen, J.J., Kitchen, N.R., Sudduth, K.A. 2000. Variability of soil and landscape attributes within subfield management zones. Proc. of the Fifth International Conf. on Precision Agriculture, Madison, WI. ASA-CSSA-SSSA. pp. 1-16. CD-ROM. Ghidey, F., Hjelmfelt, A.T. 2000. Usefulness of basins for TMDL development for watersheds on Missouri’s claypan soil. Trans. ASAE, St. Joseph, MI. Paper No. 002087. Govindaraju, R.S., Rao, A.R., Leib, D., Najjar, Y.M., Gupta, H.V., Hjelmfelt, A.T. 2000. Artificial neural networks in Hydrology I: Preliminary concepts. J. of Hydrologic Engineering. 5(2):115-123.

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Govindaraju, R.S., Rao, A.R., Leib, D., Najjar, Y.M., Gupta, H.V., Hjelmfelt, A.T. 2000. Artificial neural networks in Hydrology II: Hydrologic Applications J. of Hydrologic Engineering. 5(2):124-137. Hjelmfelt, A.T. 2000. Dynamics of a saltating particle. Proc. of XXVIth Congress of the Intl. Asso. for Hydraulic Research, London. 1:504-509. Kitchen, N.R., Sudduth, K.A., Fridgen, J.J. 2000. Influence of claypan-soil topsoil thickness and fertility factors on corn and soybean yield. Proc. of the Fifth Intern. Conf. on Precision Agriculture. Madison, WI. ASA-CSSA-SSSA. CD-ROM. Kremer, R.J. 2000. Combinations of microbial and insect agents for management of weed seeds. Proc. of Xth Intern. Symposium of Biological Control of Weeds. pp. 799-806. Kremer, R.J. 2000. Growth suppression of annual weeds by deleterious rhizobacteria integrated with cover crops. Proc. of Xth Intern. Symposium of Biological Control of Weeds. pp. 931-940. Kremer, R.J., Li, J. 2000. Rhizobacteria associated with weed seedlings in different cropping systems. Weed Sci. 48(6):734-741. Kremer, R.J., Ervin, E.H., Wood, M.T., Abuchar, D. 2000. Control of sclerotinia homoeocarpa in turfgrass using effective microorganisms. EM World. J. 1:16-21. Kramer, L.A., Alberts, E.E. 2000. Grass hedges for erosion control on a Small Hill Watershed. Trans. ASAE. St. Joseph, MI. Paper No. 002082 Li, J.M., Kremer, R.J. 2000. Rhizobacteria associated with weed seedlings in different cropping systems. Weed Science. 48(6):734-741. Myers, D.B., Kitchen, N.R., Miles, R.J., Sudduth, K.A. 2000. Estimation of a soil productivity index on claypan soils using soil electrical conductivity. Proc. of the Fifth Intern. Conf. on Precision Agriculture. CD-ROM. Madison, WI.: ASA-CSSA-SSSA. Oehrle, N.W., Karr, D.B., Kremer, R.J., Emerich, D.W. 2000. Enhanced attachment of Bradyrhizobium japonicum to soybean through reduced root colonization of internally-seedborne microorganisms. Can. J. Microbiol. 46:600-606. Sudduth, K.A., Birrell, S.J., Krumpelman, M.J. 2000. Field evaluation of a corn population sensor. Proc. of the Fifth Intern. Conf. on Precision Agriculture. Madison, WI.: ASA-CSSA-SSSA. CD-ROM. Wang, M., Hjelmfelt, A.T., Garbrecht, J. 2000. DEM aggregation for watershed modeling. J. of the American Water Resources Assoc. (3):579-584.

1999 Alberts, E.E., Blanchard, P.E., Lerch, R.N., Kitchen, N.R. 1999. Influence of cropping systems on dissolved nitrogen and atrazine transport in surface runoff from claypan soils. Proc. 3rd Natl. Workshop on Wetlands/BMPs for Nutrient Water Protection. New Orleans, LA. p. 101-103. Begonia, M.F.T., Kremer, R.J. 1999. Chemotaxis of deleterious rhizobacteria to birdsfoot trefoil. Appl. Soil Ecol. 11:35-42. Brinkman, M.A., Clay, S.A., Kremer, R.J. 1999. Influence of deleterious rhizobacteria on leafy spurge (Euphorbia esula) roots. Weed Technology. 13:835-839.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Donald, P.A., Donald, W.W., Keaster, A.J., Kremer, R.J., Kendig, J.A., Sims, B.S., Miller, J.D. 1999. Changes in Heterodera glycines egg population density in continuous glycine max over four years. J. of Nematology. 31(1):45-53. Drummond, S.T., Fraisse, C.W., Sudduth, K.A. 1999. Combine harvest area determination by vector processing of GPS position data. Trans. ASAE. 42(5):1221-1227. Drummond, S.T., Fraisse, C.W., Sudduth, K.A. 1999. Vector method for determining harvest area using combine position data. Proc. 4th Int. Conf. On Precision Agriculture. pp. 1141-1150. Fraisse, C.W., Sudduth, K.A., Kitchen, N.R. 1999. Evaluation of crop models to stimulate site-specific crop development and yield. Proc. 4th Int. Conf. on Precision Agriculture. pp. 1297-1308. Fraisse, C.W., Sudduth, K.A., Kitchen, N.R., Fridgen, J.J. 1999. Use of unsupervised clustering algorithms for delineating within-field management zones. ASAE Annualual Int. Mtg. Tech. Papers. Paper No. 993043. CD-ROM. Ghidey, F., Alberts, E.E., Kitchen, N.R. 1999. Evaluation of the root zone water quality model using field-measured data from the Missouri MSEA. Agronomy J. 91:183-192. Ghidey, F., Alberts, E.E., 1999. Temporal and spatial variability of nitrates in a claypan soil. J of Environ. Qual. 28:584-594. Ghidey, F., Alberts, E.E., Kitchen, N.R., Lerch, R.N. 1999. Farming system effects on nitrate loss to surface runoff. ASAE. Paper No. 99-2189. Hjelmfelt, A.T., Wang, M. 1999. Modeling hydrologic and water quality responses to grass waterways. J. of Hydrologic Engineering. 4(3):251-256. Hjelmfelt, A.T., Blanchard, P.E., Donald, W.W., Alberts, E.E., 1999. Influence of cropping systems on dissolved nitrogen and atrazine transport in surface runoff from claypan soils. Proc. 3rd Natl. Workshop on Wetlands/BMPs for Nutrient Water Protection. New Orleans, LA. pp. 101-103. Kitchen, N.R., Spautz, R.E., Sudduth, K.A. 1999. Can topsoil thickness be used to help determine crop P and K nutrient needs? Better Crops with Plant Food. 83(2):4-6. Kitchen, N.R., Sudduth, K.A., Drummond, S.T. Soil electrical conductivity as a crop productivity measure for claypan soils. J. of Production Agriculture. 12(4):607-617. Kremer, R.J. 1999. Integrated weed management: Biological implications and future prospects. Proc. Agric. Sci. Technol. Next Generation. p. 4-14. Kremer, R.J. 1999. Growth suppression of annual weeds by deleterious rhizobacteria integrated with cover crops. Proc. of the X International Symposium on Biological Control of Weeds. 4:931-940. Lerch, R.N., Thurman, E.M., Blanchard, P.E. 1999. Hydroxyatrazine in soils and sediments. J. of Environ. Toxicology and Chemistry. 18(10):2161-2168. Smith, M.B., Kitchen, N.R., Lerch, R.N., Alberts, E.E., Prato, T.A. 1999. An integrated systems approach to watershed management and water quality. Proc. Third Natl. Workshop on Constructed Wetlands/BMPs. New Orleans, LA. pp. 108-110 Smith, M.B., Kitchen, N.R., Lerch, R.N., Alberts, E.E., Prato, T.A. 1999. Development of agricultural systems for environmental quality (ASEQ) for claypan soil watersheds. Proc. Third Natl. Workshop on Constructed Wetlands/BMPs. New Orleans, LA. pp. 139-141.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Sudduth, K.A. 1999. Engineering technologies for precision farming. Proc. Intern. Seminar on Agric. Machinery Technol. for Precision Farming. Rural Development AdmIn., Suwon, Republic of Korea. pp. 5-27. Sudduth, K.A., Kitchen, N.R., Drummond, S.T. 1999. Soil conductivity sensing on claypan soils: Comparison of electromagnetic induction and direct methods. Proc. 4th Int. Conf. on Precision Agric. pp. 979-990. Swisher, D.W. 1999. Optical measurement of granular fertilizer flow rates for precision farming. M.S. Thesis, Department of Biological and Agricultural Engineering, Univ. of Missouri. pp.145. Swisher, D.W., Sudduth, K.A., Borgelt, S.C. 1999. Optical measurement of granular fertilizer flow rates for precision agriculture. ASAE Annual Int. Meeting Tech. Papers. Paper No. 993111. CD-ROM. Wang, M., Duru, J.O., Hjelmfelt, A.T., Thompson, A.L. et al. 1999. Evaluating HSPF for simulating sediment yield from a claypan agricultural watershed in central MO. ASAE Annual Intern. MeetingTech. Papers. Paper No. 992071. CD-ROM.

1998 Bergfield, W.A., Sasseville, D.N., Kremer, R.J. 1998. Populations and potential phyotoxicity of rhizobacteria from benomyl treatments. Proc. 16th World Congr. Soil Sci. Int. Soil Sci. Soc. CD-ROM. p. 7 Begonia, M.F.T., Kremer, R.J., Begonia, G. 1998. Biological control of weeds: Effects of rhizobacteria inoculation on the growth of velvetleaf (abutilon theophrasti medik.). J. of the Mississippi Academy of Sci. 43(2):107-117. Carlson, S.J. Donald, W.W. 1998. Fall-applied glyphosate for Canada thistle (Cirsium arvense) control in spring wheat (Tritium aestivum). Weed Technology. 2:445-455. Clark, R.B., Alberts, E.E., Zobel, R.W., Sinclair, T.R., Miller, M.S., Kemper, W.D., Foy, C.D. 1998. Eastern gama grass (Tropism dactyl ides) root penetration and chemical properties of claypan soils. Proc. of the 5th Symposium of the Internat. Soc. of Root Research. Kluwer Academic Publishers, Dordrecht, the Netherlands. Donald, W.W. 1998. Estimating relative crop yield loss resulting from herbicide damage using crop ground cover or rated stunting, with maize and sethoxydim as a case study. Weed Research. 38:425-431. Donald, W.W. 1998. Estimated soybean (Glycine max) yield loss from herbicide damage using ground cover or rated stunting. Weed Sci. 46:454-458. Donald, W.W. 1998. Established foxtail barley, Hordeum jubatum, control with glyphosate plus ammonium sulfate. Weed Technology. 2:364-368. Donald, W.W., Hjelmfelt, A.T., Alberts, E.E. 1998. Herbicide distribution and variability across Goodwater Creek watershed in north central Missouri. J. Environ. Qual. 27:999-1009. Drummond, S.T., Joshi, A., Sudduth, K.A. 1998. Application of neural networks: precision farming. Proc. Internat. Joint Conf. on Neural Networks, WCCI 98:211-215. Fraisse, C.W., Sudduth, K.A., Kitchen, N.R. 1998. GIS-based integrated modeling systems for site-specific crop management. ASAE Annual Intern. Meeting Technical Papers. Paper No. 981114. CD-ROM. Ghidey, F., Alberts, E.E. 1998. Chemical transport in surface runoff: field-scale study. ASAE. Paper No. 98-2143. Ghidey, F., Alberts, E.E. 1998. Runoff and soil losses as affected by corn and soybean tillage systems. J. of Soil and Water Conservation. 53(1):64-70. Hjelmfelt, A.T., Wang, M. 1998. Modeling hydrologic and water quality responses to grass waterways. J. ASCE, Hydrologic Engineering. 4(3):251-256.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Hummel, J.W., Sudduth, K.A., Birrell, S.J. 1998. Real-time close-range sensors for site-specific crop management. Proc. First Internat. Conf. on Geospatial Information in Agriculture and Forestry. 1:342-354. Kitchen, N.R., Hughes, D.F., Donald, W.W., Alberts, E.E. 1998. Agrichemical movement in the rootzone of claypan soils: ridge- and mulch-tillage systems compared. Soil and Tillage Research. 48:179-193. Kitchen, N.R., Sudduth, K.A., Drummond, S.T. 1998. An evaluation of methods for determining site specific management zones. Proc. N. Central Extension-Industry Soil Fertility Conf. pp. 133-139. Kremer, R.J. 1998. Microbial interactions with weed seeds and seedlings and its potential for weed management. IN: J.L. Hatfield, D.D. Buhler, and B.A. Stewart (editors) Integrated Weed & Soil Management, Ann Arbor Press, Chelsea, MI. pp. 161-179 Kremer, R.J., Souissi, T., Stanley, L. 1998. Characterization of rhizosphere microorganisms for potential as biological control agents of weeds. Proc. 16th World Congress of Soil Sci. p. 192. Lerch, R.N., Blanchard, P.E., Thurman, E.M. 1998. Contribution of Hydroxylated Atrazine Degradation Products to the total atrazine load in midwestern streams. Environmental Sci. & Technology. 32(1):40-48. Nielsen, R.D., Hjelmfelt, A.T. 1998. Hydrologic soil group assessment. Water Resources Engineering 98. In: Abt, Young-Pezeshk and Watson (editors), Proc. of Internat. Water Resources Eng. Conf., Am. Soc. Civil Engr. pp. 1297-1302. Souissi, T., Kremer, R.J. 1998. Association of deleterious rhizobacteria with the roots of leafy spurge (Euphorbia esula L.). Proc. 16th World Congress of Soil Science. p.195. Souissi, T., Kremer, R.J. 1998. A rapid microplate callus bioassay for assessment of rhizobacteria for biocontrol of leafy spurge (Euphorbia esula L.). Biocontrol Sci. & Techno. 8:83-92. Stanley, L. 1998. A characterization of bacterial populations from two Sites. University of Missouri, Columbia. pp. 183. Stanley, L. Kremer, R.J. 1998. Characterization of bacteria from two claypan landscape positions in central Missouri USA. Proc.16th World Congr. Soil Sci. Int. Soil Sci. Soc. CD-ROM 6 pp. (refereed Proc.) Sudduth, K.A. 1998. Engineering and application of precision farming technology. Integrated Weed and Soil Management. pp. 311-331. Sudduth, K.A. 1998. Engineering for precision agriculture past accomplishments and future directions. Agricultural Machine Systems, Special Publ. 1383. SAE, Warrendale, PA. pp. 29-36. Sudduth, K.A., Drummond, S.T., Wang, W., Krumpelman, M.J., Fraisse, C.W. 1998. Ultrasonic and GPS measurement of combine swath width. ASAE Annual Intern. Meeting Technical Papers. Paper 983096. CD-ROM. Sudduth, K.A., Fraisse, C.W., Drummond, S.T., Kitchen, N.R. 1998. Integrating spatial data collection... precision agriculture. Proc. 1st Internat. Conf. on Geospatial Information in Agriculture and Forestry. 2:166-173. Sun, X, Thompson, A.L., Hjelmfelt, A.T., Sievers, D.M. 1998. Influence of solids on hydraulic properties of submerged flow wetlands. In: On-site wastewater treatment. Proc. 8th Natl. Symposium on Individual and Small Community Sewage Systems. Am. Soc. Agric. Engineers, Orlando: pp. 211-219. Thompson, A., Sun, X., Hjelmfelt, A.T. 1998. Hydraulics of submerged flow constructed wetlands with plants. IN: Water Resources Eng. 98, Abt, Young, and Watson, eds. Proc. of Internat. Water Resources Engineering Conf., Am. Soc. Civil Engineers, Memphis, TN.: pp. 550-55.

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Wang, M., Hjelmfelt, A.T. 1998. DEM based overland flow routing model. J of Hydrologic Engineering. 3(1):1-8.

1997 Alberts, E.E., Ghidey, F. 1997. Comparison of WEPP model predictions to measured erosion losses for large events. Eurasian Soil Sci. 30(5):564-568. Aldrich, R.J., Kremer, R.J. 1997. Principles in weed management. Iowa State Univ. Press, Ames. pp. 472. Bergfield, W.A., Sasseville, D.N., Kremer, R.J., Souissi, T. 1997. Microbial Populations and Potential Phytotoxicity of Rhizobacteria Isolated from Jamaican Anthurium. HortScience. 32(3):468. Blanchard, P.E., Donald, W.W. 1997. Herbicide contamination of groundwater beneath claypan soils in North-Central Missouri. J. Enviro. Qual. 26:1612-1621. Borgelt, S.C., Wieda, R.E., Sudduth, K.A. 1997. Geostatistical analysis of soil chemical properties from nested grids. Applied Engineering in Agriculture. 13(4):477-483. Forcella, F., Wilson, R.G., Dekker, J., Kremer, R.J., Cardina, J., Anderson, R.L., Alm, D., Renner, K.A., Harvey, R.G., Clay, S.A., Buhler, D.D. 1997. Weed seed bank emergence across the corn belt. 1991-1994. Weed Sci. 45:67-76. Ghidey, F., Alberts, E.E. 1997. Comparison of soil loss predictions from WEPP, RUSLE, and USLE to measured losses for corn and soybean. J. Soil and Water Conservation. 52(4):302. Ghidey, F, Alberts, E.E., 1997. Plant root effects on soil erodibility, splash detachment, soil strength, and aggregate stability. Trans. ASAE. 40(1):129-135. Ghidey, F., Alberts, E.E., Lerch, R.N. 1997. Spatial and temporal variability of herbicides in a claypan soil watershed. J of Enviro. Qual. 26:1555-1563. Hjelmfelt, A.T., Wang, M. 1997. Using modeling to investigate impacts of grass waterway on water quality. Reprinted from Environmental and coastal Hydraulics: Protecting the Aquatic Habitat. Proc. of Theme B: Water for a Changing Global Community. The 27th Congress of the Internat. Assoc. for Hydraulic Research, Water Resources Engineering Div., ASCE, San Francisco, CA. pp.1420-1425. Kemper, W.D., Alberts, E.E., Foy, C.D., Clark, R.B., Ritchie, J.C., Zobel, R.W. 1997. Aerenchyma, acid tolerance and associative N fixation enhance carbon sequestration in soil. Chapter 16,221-234 In: R. Lal, J.M. Kimble, R.F. Follett, and B.A. Stewart (eds) Management of Carbon Sequestration in Soil. CRC Press, Boca Raton, FL. Kitchen, N.R., Blanchard, P.E., Hughes, D.F., Lerch, R.N. 1997. Impact of historical and current farming systems on groundwater nitrate in northern Missouri. J. Soil and Water Conservation. 52(4):272-277. Kolberg, R.L., Kitchen, N.R., Westfall, D.G., Peterson, G.A. 1997. Cropping intensity and nitrogen management impact of dryland no-till rotations in the semi-arid western Great Plains. J. of Production Agriculture. 10(3):517-522. Lerch, R.N., Thurman, E.M., Kruger, E.L. 1997. Mixed-mode sorption of hydroxylated atrazine degradation products to soil: A mechanism for bound residue. Environ. Sci. and Technol. 31(5):1539-1546. Souissi, T., Kremer, R.J., White, J.A. 1997. Scanning and transmission electron microscopy of root colonization of leafy spurge (Euphorbia Esula L.) Seedlings by rhizobacteria. Phytomorphology. 47(2):177-193. Souissi, T., Kremer, R.J., 1997. Interaction of rhizobacteria with leafy spurge (Euphorbia esula L.) Callus tissue cells. Plant Cell Tiss. Organ Cult. 47:279-287.

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Contact: Research Leader E. John Sadler, USDA-ARS-CSWQRU 269 Agricultural Engineering Building, University of Missouri, Columbia, Missouri 65211

Sudduth, K.A. 1997. Site-specific management and the seed industry. Proc. 27th Annual Soybean Seed Research Conf.:41-53. Sudduth, K.A., Hummel, J.W., Birrell, S.J. 1997. Sensors for site-specific management. ASA-CSSA-SSSA. p.183-209.

1996 Birrell, S.J., Sudduth, K.A., Borgelt, S.C. 1996. Comparisons of sensors and techniques for crop yield mapping. Computers and Electronics in Agric. 14:215-233. Blanchard, P.E., Hjelmfelt, A.T. 1996. Herbicides as tracers of ground water-surface water interaction. Am. Geophysical Union, EOS Trans. 77:264-265. Borgelt, S.C., Harrison, J.D., Sudduth, K.A., Birrell, S.J. 1996. Evaluation of GPS for applications in precision agriculture. Applied Engineering in Agric.12(6):633-638. Clark, R.B., Alberts, E.E., Zobel, R.W., Sinclair, T.R., Miller, M.S., Kemper, W.D., Foy, C.D. 1996. Eastern gamagrass (Tripsacum dactyloides) root penetration and chemical properties of claypan soils. Proc. of the 5th Symposium of the Internat. Society of Root Research. Kluwer Academic Publishers, Dordrecht, the Netherlands. Donald, W.W., Khan, M. 1996. Canada thistle (Cirsium arvense) effects on yield components of spring wheat (Triticum aestivum). Weed Science. 44(1):114-121. Duru, J.O., Hjelmfelt, A.T. 1996. Investigating prediction capability of HEC-1 and KINEROS kinematic wave runoff models Reply. J. Hydrology. 179:395-397. Ghidey, F., Alberts, E.E. 1996. Comparison of measured and WEPP predicted runoff and soil loss for midwest claypan soil. Trans. ASAE. 39(4):1395-1402. Ghidey, F., Alberts, E.E., Birrell, S.J. 1996. Variability and distribution of agrichemicals in a claypan soil. ASAE. Paper No. 96-2082. Hjelmfelt, A.T., Wang, M. 1996. Predicting runoff using artificial neural networks. V.P. Singh and B. Kumar (editors), Surface-Water Hydrology. Kluwer Academic Publishers. p. 233-244. Hjelmfelt, A.T., Thompson, A.L. 1996. Hydraulics of subsurface flow in constructed wetlands. Proc. Of N. Am. Water and Environ. Congress. Am. Soc. Civil Engineers (CD-ROM) Hummel, J.W., Gaultney, L.D., Sudduth, K.A. 1996. Soil property sensing for site-specific crop management. Computers and Electronics in Agric. 14:121-136. Hummel, J.W., Sudduth, K.A., Birrell, S.J. 1996. Real-time soil and crop sensors-how well do they work? IN: New trends in farm machinery development, SAE, Warrendale, PA. Spec. Pub. 1194. pp. 1-9. Kennedy, A.C., Kremer, R.J. 1996. Microorganisms in weed control strategies. J. Prod. Agric. 9:480-485. Khan, M., Donald, W.W., Prato, A. 1996. Spring wheat (Triticum aestivum) management can substitute for diclofop for foxtail (Setaria spps.) control. Weed Science. 44: 362-372. Kitchen, N.R., Sudduth, K.A., Drummond, S.T. 1996. Mapping of sand deposition from 1993 midwest floods with electromagnetic induction measurements. J. of Soil and Water Conserv. 51(4):336-340. Kitchen, N.R., Sudduth, K.A., Drummond, S.T., Birrell, S.J. 1996. Spatial prediction...electromagnetic induction. pp. 83-87. In: MO. Soil Fertility...Res. Update: 1995, Agron. Misc. Pub. 96-03, Univ. of Missouri, Columbia.

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Kitchen, N.R., Sudduth, K.A., Drummond, S.T., Birrell, S.J. 1996. Spatial preduction ...electromagnetic induction. 12:1-6. In: Proc. N. Cent. Ext.-Ind. Soil Fertility Conf. Potash & Phosph. Inst., Manhattan, KS. Kremer, R.J., Sasseville, D.N., Mills, H.A. 1996. Promotion of phytotoxic bacteria in rhizospheres of leatherleaf fern by Benlate DF. J. Plant Nutr. 19:939-953. Kremer, R.J., Kennedy, A.C. 1996. Rhizobacteria as biocontrol agents of weeds. Weed Technol. 10:601-609. Lerch, R.N., Donald, W.W., Li, Y.X., Alberts, E.E. 1996. Hydroxylated atrazine degradation products in a small Missouri stream. In: M.T. Meyer and E.M. Thurman (eds). Herbicide metabolites in groundwater. ACS Symp. Series 630. Washington, D.C. pp. 254-270. Lerch, R.N., Thurman, E.M. 1996. Extraction of hydroxylated atrazine degradation products from soil by cation exchange. In: Abstr. 211th Am. Chem. Soc. Nat. Meeting. Agrochemicals Section 068. New Orleans, LA. Mills, H.A., Sasseville, D.N., Kremer, R.J. 1996. Effects of Benlate on leatherleaf fern growth, root morphology and rhizosphere bacteria. J. Plant Nutr. 19:917-937. Souissi, T., Kremer, R.J., White, J.A. 1996. Interaction of rhizobacteria with leafy spurge (Euphorbia esula L) callus tissue cells. Plant Cell Tissue and Organ Culture. 47(3):279-287. Sudduth, K.A., Birrell, S.J., Drummond, S.T. 1996. Acquisition and interpretation of spatial data for precision farming. In: Proc. 26th Annual. Symp. on Remote Sensing of Environ. and 18th Symp. of Canadian Remote Sensing Soc., Ottawa. pp. 600-603. Sudduth, K.A., Hummel, J.W. 1996. Geographic operating range evaluation of a NIR soil sensor. Trans. ASAE. 39(5):1599-1604. Sudduth, K.A., Drummond, S.T., Birrell, S.J., Kitchen, N.R. 1996. Spatial analysis of yield limiting factors. In: Proc. 26th N. Central Ext.-Industry Soil Fertility Conf: 50-59. Potash & Phosphate, Inst., Brookings, SD. Wang, M., Hjelmfelt, A.T. 1996. A DEM based hydrologic and sediment transport model. Proc. of N. Am. Water and Environ. Congr., Am. Soc. Civil Eng. 6 pp. CDROM.

1995 Alberts, E.E., Hjelmfelt, A.T., Donald, W.W., Kitchen, N.R. 1995. Herbicide transport in surface runoff from three field-sized watersheds. MO. Proc. Clean Water-Clean Environ.-21st Century I.5-8. Alberts, E.E., Hjelmfelt, A.T., Donald, W.W., Kitchen, N.R. 1995. Herbicide transport in surface runoff from watersheds on claypan soils. Proc. 5th Annual Water Quality Conf., Agric. Exp. Stn., Univ. of Missouri, Columbia. pp 4-10. Alberts, E.E., Nearing, M.A., Weltz, M.A., Risse, L.M., Pierson, F.B., Zhang, X.C., Laflen, J.M., Simanton, J.R. 1995. Soil component, In D.C. Flanagan and S.J. Livingston (eds). USDA-Water Erosion Prediction Project, WEPP User Summary. NSERL Rept. No. 11. Natl. soil Erosion Res. Lab, USDA-ARS, W. Lafayette, IN. pp. 7.1-7.47. Alberts, E.E., Prato, T., Kitchen, N.R., Killpack, S.C. 1995. Research needs and plans of the Missouri MSEA Project. Proc. 5th Annual Water Quality Conf., Agric. Exp. Stn., Univ. of Missouri, Columbia. pp 172-176. Anderson, S.H., Kitchen, N.R., Prato, A.A., Alberts, E.E. 1995. MSEA Project background and goals. Proc. 5th annual Water Quality Conf., Agric. Exp. Stn., Univ. of Missouri, Columbia. pp. 1-3. Arnold, J.G., Weltz, M.A., Alberts, E.E., Flanagan, D.C. 1995. Plant growth component, In D.C. Flanagan and S.J. Livingston (editors). USDA-Water Erosion Prediction Project, WEPP User Summary. NSERL Rept. No. 11. Natl. Soil Erosion Res. Lab., USDA-ARS, W. Lafayette, IN. pp. 8.1-8.41.

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Ben-Hammouda, M., Kremer, R.J., Minor, H.C. 1995. Phyotoxicity of extracts from sorghum plant components on wheat seedlings. Crop Sci. 35:1652-1656. Ben-Hammouda, M., Kremer, R.J., Minor, H.C., Sarwar, M. 1995. A chemical basis for differential allelopathic potential of sorghum hybrids on wheat. J. of Chemical Ecology. 21(6):775-786. Birrell, S.J., Sudduth, K.A. 1995. Corn population sensor for precision farming. ASAE. Paper No. 951334. Birrell, S.J., Sudduth, K.A., Borgelt, S.C. 1995. Crop yield mapping: comparison of yield monitors and mapping techniques. In Proc. Site-Specific Mgmt for Agric. Systems, Am. Soc. of Agronomy, Madison, WI. pp. 15-31. Blanchard, P.E., Donald, W.W., Alberts, E.E. 1995. Herbicide concentrations in groundwater in a claypan soil watershed. Proc. Clean Water-Clean Environ.-21st Century V. I:21-24. ASAE, St. Joseph, MI. Blanchard, P.E., Donald, W.W., Alberts, E.E. 1995. Herbicide concentrations in groundwater in a claypan soil watershed. Proc. 5th annual Water Quality Conf., Agric. Exp. Stn., Univ. of Missouri, Columbia. pp. 22-25. Buyanovsky, G.A., Kremer, R.J., Gajda, A.M., Kazemi, H.V. 1995. Effect of corn plants and rhizosphere populations on pesticide degradation. Bull. Environ. Contam. Toxicol. 55:689-696 Donald, W.W., Eastin, E.F. 1995. Weed management systems for grain crops, Chapter 11, pp. 401-476. In A.E. Smith (ed.) Handbook of Weed Managements systems. Marcel Dekker, Inc., New York, NY. Donald, W.W., Schwartz, P.H. 1995. Standard operating procedures (SOPs) for research in weed science. Weed Technol. 9:397-401. Donald, W.W., Lerch, R.N., Hjelmfelt, A.T., Alberts, E.E. 1995. Herbicides and degradation products contaminate Goodwater Creek, MO. Proc. Clean Water-Clean Environ.-21 Century V. I:61-64. Drummond, S.T., Birrell, S.J., Sudduth, K.A. 1995. Bio-directional serial to parallel converter for data acquisition and control. Trans. ASAE 38(6):1939-1941. Drummond, S.T., Sudduth, K.A., Birrell, S.J. 1995. Analysis and correlation methods for spatial data. ASAE. Paper No. 951335. Ghidey, F., Alberts, E.E., Kramer, L.K. 1995. Comparison of runoff and soil loss predictions from the WEPP Hillslope Model to measured values for 8 cropping and management treatments. ASAE. Paper 952383. 13 pp. Ghidey, F., Alberts, E.E., Kitchen, N.R. 1995. Validation of Root Zone Water Quality Model (RZWQM) for claypan soils. In Proc. 5th Annual Mo. Water Quality Conf. Feb. 2-3. Columbia, MO (8 pages). Hjelmfelt, A.T., Donald, W.W., Alberts, E.E., Lerch, R.N. 1995. Distribution of herbicides in Goodwater Creek. MO. Proc. 5th Annual Water Quality Conf., Agric. Exp. Stn. Univ. of MO., Columbia. pp. 16-22. Hjelmfelt, A.T., Brooker, D.B. 1995. Nonlinear flow through an anistropic porous media. ASAE. 38(3):863-868. Hjelmfelt, A.T. 1995. Unifying unit hydrograph methods. In: Water Resources Engineering. Proc. of the First Intl Conf. Water Resources Eng. ASCE. pp. 1678-1682. Hughes, D.F., Kitchen, N.R., Donald, W.W., Alberts, E.E. 1995. Root-zone water quality and grain production at the MO. MSEA. Proc. Clean Water-Clean Environ.-21st Century III:137-130. Jordan, D., Kremer, R.J., Bergfield, W.W., Kim, K.Y., Cacino, V.N. 1995. Evaluation of microbial methods as potential indicators of soil quality in historical agricultural fields. Biol Fertil Soils. 19:297-302.

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Kitchen, N.R., Sudduth, K.A., Hughes, D.F., Drummond, S.T., Birrell, S.J. 1995. On-the-go changes in fertilizer rates to agree with claypan productivity. In. Proc. Clean Water. Conf. Nutrients, V 2. ASAE, St. Joseph, MI. pp. 103-103-106 Kitchen, N.R., Sudduth, K.A., Hughes, D.F., Birrell, S.J. 1995. Comparison of variable rate to single rate nitrogen fertilizer application: corn production and residual soil N03-N. In Proc. Site-Specific Systems, Am. Society of Agronomy, Madison, WI. pp. 427-439. Kramer, L. K., Alberts, E.E. 1995. Validation of WEPP 95.1 daily erosion simulation. ASAE, Joseph, MI. Paper 952384. Kremer, R.J. 1995. Integration of a seed-feeding insect and fungi for management of velvetleaf seed production. Proc. VIII Int. Symp. Biol. Cont. Weeds, SIR/CSIRO, Melbourne. pp. 27-631. Kremer, R.J., Sarwar, M. 1995. Microbial metabolites with potential applications in weed management. Proc. Plant Growth Regul. Soc. Amer. Quarterly 23:71. Lerch, R.N., Donald, W.W., Yong-Xi Li, Alberts, E.E. 1995. Hydroxylated atrazine degradation products in a small Missouri stream. Environ. Sci. & Techno. 29(11):2759-2768. Lerch, R.N., Donald, W.W., Li, Y.X., Alberts, E.E. 1995. Hydroxylated atrazine degradation products in a small Missouri stream. Proc. 5th Annual Water Quality Conf., Agric. Exp. Stn., Univ. of Missouri, Columbia, MO. pp. 11-15. Sarwar, M., Kremer, R.J. 1995. Enhanced suppression of plant growth through production of Ltryptophan-derived compounds by deleterious rhizobacteria. Plant and Soil. 172:261-269. Sarwar, M., Kremer, R.J. 1995. Determination of bacterially derived Auxins Using a Microplate Method. Letters in Applied Microbiology. 20:282-285. Stott, D.E., Alberts, E.E., Weltz, M.A. 1995. Residue decomposition and management. In D.C. Flanagan and S.J. Livingston (editors) USDA-Water Erosion Prediction Project, WEPP User Summary, NSERL Rept. No. 11. Natl. Soil Erosion Res. Lab., USDA-ARS, W. Lafayette, IN. pp. 9.1-9.16. Sudduth, K.A., Borgelt, S.C., Hou, J. 1995. Performance of a chemical injection sprayer system. Applied Engineering in Agriculture V. 11(3):343-348. Sudduth, K.A., Kitchen, N.R., Hughes, D.F., Drummond, S.T. 1995. Electromagnetic induction sensing as an indicator of productivity on claypan soils. ASA-CSSA-SSSA. Site Specific Management for Agricultural Systems. American Soc. of Agronomy, Madison, WI. pp.671-681 Sudduth, K.A., Birrell, S.J., Borgelt, S.C. Kitchen, N.R., Hughes, D.F. 1995. Precision farming technology application to claypan soils. In. Proc. Clean Water-Clean Environment-21st Century Conf.,Vol. 3 – Practices, Systems, and Adoption. ASAE. St. Joseph, MI. pp. 267-270 Zhu, J.C., Gantzer, C.J., Peyton, R.L., Alberts, E.E., Anderson, S.H. 1995. Simulated small-channel bed scour and head cut erosion rates compared. Soil Sci. Soc. of America J. 59:211-218.

1994 Alberts, E.E., Kneibling, W.H. 1994. Influence of crop residue on water erosion. Chapter 3, In: Paul W. Unger (ed.) Managing Agricultural Residues. CRC Press, Inc., Boca Raton, FL. pp. 19-39. Alberts, E.E., Ghidey, F., Kramer, L.A. 1994. Comparison of runoff and soil loss predictions from the WEPP hillslope model to measured values for seven cropping and management treatments. ASAE. Paper No. 942605.

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Begonia, M.F.T., Kremer, R.J. 1994. Chemotaxis of deleterious rhizobacteria to velvetleaf (Abutilon theophrasti Medik.) seeds and seedlings. FEMS Microbiology Ecology. 15(3-4):227-236. Breida, J.J., Kremer, R.J., Brown, J.R. 1994. Indications of associative nitrogen fixation in eastern gamagrass. J. Range Management. 47:192-196. Donald, W.W. 1994. Geostatistics for mapping weeds, with a Canada thistle (Cirsium arvense) patch as a case study. Weed Sci. 42:648-657. Donald, W.W. 1994. The biology of Canada thistle (Cirsium arvense). Rev. Weed Sci. 6:77-101. Donald, W.W. 1994. A method of validating the Tetrazolium assay for testing viability of dormant jointed goatgrass (Aegilops cylindrica) seed. Weed Sci. 42:502-508. Doolittle, J.A., Sudduth, K.A., Kitchen, N.R., Indorante, S.J. 1994. Estimating depths to claypans using electromagnetic induction methods. J. Soil and Water Conserv. 49(6):572-575. Duru, J.O., Hjelmfelt, A.T. 1994. Investigating prediction capability of HEC-1 and KINEROS kinematic wave runoff models. J. of Hydrology. 157:87-103. Ghidey, F., Alberts, E.E. 1994. Spatial and temporal variability in agrichemicals from a claypan soil. ASAE. Paper No. 942606. p. 14. Ghidey, F., Alberts, E.E. 1994. Interril erodibility affected by cropping systems and initial soil water content. Trans, ASAE. 37(6):1809-1815. Hjelmfelt, A.T., Wang, M. 1994. General stochastic unit hydrograph. J. Irrigation and Drainage Engineering. Am. Soc. Civil Engrs. 120(1):139-148. Jordan, D., Kremer, R.J. 1994. Potential use of soil microbial activity...soil quality. In C.E. Pankhurst et al. (Ed.) Soil biota: Management in sustainable farming systems. CSIRO, E. Melbourne, Australia. pp. 245-249. Kitchen, N.R., Sudduth, K.A., Hughes, D.F., Birrell, S.J. 1994. Variable rate versus single rate nitrogen fertilizer application...MO soil...res. Up date 1993. U of MO, Columbia. Agron. Publ. 94-03, pp. 21-23. Kramer, L.A., Hjelmfelt, A.T. 1994. Hydrologic effects of cropping and conservation practices on agricultural fields in southwestern Iowa. American Water Resources Association, June 1994. Pp. 1097-1106. Kramer, L.A., Alberts, E.E. 1994. Validation of WEPP 94.7 hillslope erosion model with plot data. Am. Soc. Of Agric. Engineers. Paper No. 942606. 15 pp. Kremer, R.J. 1994. Determination of soil phosphatase activity using a croplate method. Commun. Soil Sci. Plant Anal., 25(3&4):319-325. Kremer, R.J. 1994. Management of velvetleaf seed production in cropping systems using integrated biological control. Proc. Agric. Res. Protect Water Qual. pp. 639-642. Lerch, R.N., Donald, W.W. 1994. Analysis of hydroxylated atrazine degradation products in water using solid-phase extraction and high-performance liquid chromatography. J. Agric. Food Chem. 42(4):922-927. Pi, Z., Hjelmfelt, A.T. 1994. Analysis of lateral subsurface flow using the hybrid-finite-analytic technique. Water Resources Research. Am. Geophys. Union. 3(5):1471-1478. Souissi, T., Kremer, R.J. 1994. Leafy spurge (Euphorbia esula) cell cultures for screening deleterious Rhizobacteria. Weed Science. 42:310-315.

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Sudduth, K.A., Borgelt, S.C., Birrell, S.J., Kitchen, N.R. 1994. Within field location and sensing technology. Am. Soc. Photogrammetry and Remote Sensing, Bethesda, MD. Proc. 1994 ASPRS/ACSM Annual Conv. 1:624-633. Ward, A.D., Hatfield, J.L., Lamb, J.A., Alberts, E.E., Logan, T.J., Anderson, J.L. 1994. The management systems evaluation areas program: tillage and water quality research. Soil and Tillage Research. 30:49-74. Zhanzhong, P., Hjelmfelt, A.T. 1994. Hybrid finite analytic solution of lateral subsurface flow. Water Resources Research. 30(5):1471-1478.

1993 Alberts, E.E., Ghidey, F. 1993. Comparison of WEPP model predictions to measured erosion losses for large events. Translated into the Russian J. of Soil Science. 30:564-568. Alberts, E.E., Hjelmfelt, A.T., Donald, W.W., Kitchen, N.R. 1993. Impact of prevailing farming of a claypan soil. Proc. Agric. Research to Protect Water Quality. Soil & Water Conservation Soc., Ankeny, IA. pp. 439-444. Alberts, E.E., Prato, T., Kitchen, N.R., Blevins, D.W. 1993. Research and education to improve quality of a claypan soil. Proc. Agric. Research to Protect Water Quality. Soil and Water Conserv. Soc. Ankeny, IA. pp. 21-33. Begonia, M.F.T., Kremer, R.J., Beuselinck, P.R. 1993. Association of rhizobacteria with birdsfoot trefoil roots. Trans. MO. Acad. Sci. 27:1-8. Blanchard, P.E., Kitchen, N.R., Donald, W.W., Heidenrich, L.K. 1993. Ground water transport...at the Missouri MSEA. Proc. Agric. Research to Protect Water Quality. Soil & Water Conserv. Soc. Ankeny, IA. pp. 324-327. Buyanovsky, G. A., Gajda, A.M., Kremer, R.J., Peiczonka, G.J. 1993. Effect of soil depth on carbofuran and aldicarb degradation. IN: D.M. Linn (ed.) Sorption and Degradation of Pesticides and Organic Chemicals in Soil. Soil Sci. Soc. Am. Spec. Publ. No. 32, Madison, WI. pp. 65-71 Donald, W.W. 1993. Models and sampling for studying weed seed survival with wild mustard (Sinapis arvensis) as a case study. Can. J. Plant Sci. 73:637-645. Donald, W.W. 1993. Root versus shoot measurements to evaluate recovery of Canada thistle (Cirsium arvense) after several years of control treatments. Can J. Plant Sci. 73:369-373. Donald, W.W., Tanaka, F.S. 1993. The germination stimulant AC94377 reduces seed survival of wild mustard (Sinapis arvensis). Weed Sci. 41:185-193. Donald, W.W. 1993. Retreatment with fall-applied herbicides for Canada thistle (Cirsium arvense) control. Weed Sci.:41:434-440. Ghidey, F., Alberts, E.E. 1993. Residue type and placement effects on decomposition: field study and model evaluation. Trans. ASAE. 36(6):1611-1617. Ghidey, F., Alberts, E.E. 1993. Instrumentation to measure solute transfer to runoff. ASAE. Paper no. 93-3530. Ghidey, F., Alberts, E.E. 1993. Missouri MSEA modeling report. RZWQM Model evaluation by the MSEA modeling team and the USDA-ARS Great Plains Systems Research Unit (GPSR). Fort Collins, CO. p. 23-39. Ghidey, F., Alberts, E.E., Hjelmfelt, A.T. 1993. Model representation of chemical transfer to runoff. In: Proc. Agricultural Research to Protect Water Quality Conf., Minneapolis, MN., Feb. 21-24. Soil and Water Conservation Soc., Ankeny, IA. p. 592-593.

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Hatfield, J.L., Anderson, J.L., Alberts, E.E., Prato, T., Watts, D.G., Ward, A., Delin, G., Swank, R. 1993. Management systems evaluation areas–an overview. Proc. of the Conf. on Agricultural Research to Protect Water Quality, Soil and Water Conservation Society, Ankeny, IA. pp. 1-15. Havis, R.N., Alberts, E.E. 1993. Nutrient leaching from field-decomposed corn and soybean residue under simulated rainfall. Soil Science Society of America J. 56:211-218 (1993) Hjelmfelt, A.T., Pi., Z. 1993. Movement of ground water in converging aquifer. J. of Irrigation and Drainage Engineering. Vol. 119(2):312-322. Hjelmfelt, A.T., Wang, M. 1993. Artificial neural networks as unit hydrograph applications. Engineering Hydrology Symp. of the Hydraulics Division/ASCE. July 25-30, 1993. San Francisco, CA. pp. 754-759. Kremer, R.J. 1993. Management of weed seed banks with microorganisms. Ecological Applications. 3(1):42-52. Langdale, G.W., Alberts, E.E., Bruce, R.R, Edwards, W.M., Mcgregor, K.C. 1993. Concepts of residue management: Infiltration, runoff, and erosion. Advances in Soil Sci. pp. 109-123. Lerch, R.N., Donald, W.W. 1993. Analysis of hydroxylated atrazine degradation...solid-phase extraction. Proc. Agric. Research to Protect Water Quality. Soil & Water Conserv. Soc. Ankeny, IA. pp. 115-119. Lerch, R.N., Barbarick, K.A., Azari, P., Sommers, L.E., Westfall, D.G. 1993. Sewage sludge proteins: I. Extraction methodology. J. Environ. Qual. 22:620-624. Sudduth, K.A., Hummel, J.W. 1993. Portable, near-infrared spectrophotometer for rapid soil analysis. Trans. of the Am. Soc. of Eng. 36(1):185-193. Sudduth, K.A., Hummel, J.W. 1993. Soil organic matter, CEC, and moisture sensing with a portable NIR spectrophotometer. ASAE. 36(6): 1571-1582. Ward, A.D., Alberts, E.E., Anderson, J.L., Hatfield, J.L., Watts, D.G. 1993. Management systems evaluation areas program: Data collection, management and exchange. MSEA Tech. Rept 93-1. pp. 35. Wooton, M.A., Kremer, R.J., Keaster, A.J. 1993. Effects of carbofuran and the corn rhizosphere on growth of soil microorganisms. Bull. Environ. ContaIn. Toxicol. 50:49-56.

1992 Donald, W.W., Prato, T. 1992. Effectiveness and economics of repeated sequences of herbicides for Canada thistle (Cirsium arvense) control in reduced-till spring wheat (Triticum aestivum). J. Plant Sci. 72:599-618. Donald, W.W., Prato, T. 1992. Efficacy and economics of herbicides for Canada thistle (Cirsium arvense) control in no-till spring wheat (Triticum aestivum). Weed Sci. 40:233-240. Donald, W.W. Khan, M. 1992. Yield loss assessment for spring wheat (Triticum aestivum) infested with Canada thistle (Cirsium arvense). Weed Sci. 40:590-598. Donald, W.W. 1992. Herbicidal control of Cirsium arvense (L.) scop. roots and shoots in no-till spring wheat (Triticum aestivum L.). Weed Research. 32:259-266. Donald, W.W. 1992. Fall-applied herbicides for Canada thistle (Cirsium arvense) root and root bud control in reduced-till spring wheat. Weed Techno. 6:252-261. Ghidey, F., Gregory, J.M., Thompson, A.L. 1992. Terrace channel design and evaluation. Trans. of the ASABE 35(5):1513-1520.

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Edwards. D.E., Kremer, R.J., Keaster, A.J. 1992. Characterization and growth response of bacteria in soil following application of carbofuran. J. Environ. Sci. Health. B27:139-154. Khan, M., Donald, W.W. 1992. Sulfonylurea herbicides reduce survival and seed production of green and yellow foxtails (Setaria sp.). Weed Techno. 6:284-290. Lerch, R.N., Barbarick, K.A., Sommers, L.E., Westfall, D.G. 1992. Sewage sludge proteins as labile carbon and nitrogen sources. Soil Science Society of America J. 56:1470-1476. Lenau, C.W., Hjelmfelt, A.T. 1992. River bed degradation due to abrupt outfall lowering. J. of Hydraulic Engineering, 118(6):918-933. Paper No. 26636.

1991 Alberts, E.E. 1991. Influence of no-till on water and soil losses from a claypan soil. Proc. of Second Water Quality Conf., MO Agric. Exp. Station, Columbia, MO. (mimeo handout) Alberts, E.E. 1991. Temporal variation in interrill soil erodibility as influenced by soil water content. ASAE. Paper 91-2014. p. 16 Donald, W.W., Ogg JR., A.G. 1991. Biology and control of jointed goatgrass, a review. Weed Technol. 5:3-17 Donald, W.W. 1991. Seed survival, germination ability, and emergence of jointed goatgrass (Aegilops cylindrica). Weed Sci. 39:210-216. Donald, W.W. 1991. Biology and control of jointed goatgrass (Aegilops cylindrica), a review. Weed Technol. 5:3-17. Donald, W.W., Prato, T. 1991. Profitable, effective herbicides for planting-time weed control in no-till spring wheat (Triticum aestivum). Weed Sci. 39:83-90. Franz, E., Gebhardt, M.R., Unklesbay, K.B. 1991a. Shape description of completely visible and partially occluded leaves for identifying plants in digital images. Trans. ASAE. 34(2):673-681. Franz, E., Gebhardt, M.R., Unklesbay, K.B. 1991b. The use of local spectral properties of leaves as an aid for identifying weed seedlings in digital images. Trans. ASAE. 34(2):682-687. Hjelmfelt, A.T. 1991. Investigation of curve number procedure. J. Hydraulic Engr., Am. Soc. Civil Engrs. 117(6):725-737. Kramer, L.A., Alberts, E.E., Ghidey, F. 1991. Validation of WEPP 91.2 with erosion plot data. ASAE. Paper 91-2079. 15 pp. Kremer, R.J. 1991. Rhizosphere organisms for potential biocontrol of leafy spurge. In: Report of leafy spurge control coordination/planning meeting. USDA-ARS, Minneapolis, MN. pp 44-45. Kremer, R.J., Stanley, L. 1991. Rhizobacteria for potential biocontrol of broadleaf weeds, In: H.D. Skipper, A.C. Kennedy and A.G. Ogg (editors) Rhizobacteria: Prospects...Management. USDA-ARS and WSU, Pullman, WA. pp. 9-11. Kremer, R.J. 1991. Characterization of deleterious bacteria in relation to potential biocontrol of weeds. Proc. Weed Sci. Soc. Am. 31:42. Kremer, R.J., Begonia, M.F.T., Stanley, L. 1991. Deleterious rhizobacteria for biocontrol of weeds seeds and seedlings in soil. pp. 65-66 In: The rhizosphere and plant growth, 301, D.L. Keister and P.B. Cregan (editors). Kluwer Academic Pub., the Netherlands.

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Rojas, K.W., Hjelmfelt, A.T., 1991. Modeling nitrogen movement through loess soils. IN: Proc. Irrigation and Drainage Natl. Conf., Am. Soc. Civil Engineers. pp. 662-668 Schepers, J.S., Moravek, M.G., Alberts, E.E., Frank, K.E. 1991. Maize production impacts on groundwater quality. J. of Environmental Quality. 20(1):12-16. Sudduth, K.A. 1991. Analysis Methods for multivariate data. Am. Soc. of Agric. Engr. Meeting Presentation Paper #913034. Sudduth, K.A., Hummel, J.W. 1991. Evaluation of reflectance methods for soil organic matter sensing. Trans. ASAE. 34(4):1900-1909. Sudduth, K.A., Hummel, J.W., Cahn, M.D. 1991. Soil organic matter sensing: a developing science. In: Automated Agriculture for the 21st Century, Proc. 1991 Symp. ASAE Pub. 1191. p. 307-316. Zhu, J.C., Gantzer, C.J., Anderson, S.H., Beuselinck, P.R., Alberts, E.E. 1991. Water use evaluation of winter cover crops for no-till soybeans. J. Soil Water Conserv. 46(6):446-449.

1990 Begonia, M.F.T., Kremer, R.J., Stanley, L., Jamshedi, A. 1990. Association of bacteria and velvetleaf roots. Trans. MO Acad. Sci. 24:17-26. Deer-Ascough, L.A., Weesies, G.A., Ascough, J.C., Alberts, E.E. 1990. Expert system for crop parameterization for the WEPP model. ASAE. Paper 90-7016. 7 pp. Donald, W.W. 1990. Management and control of Canada thistle (Cirsium arvense). Reviews of Weed Science. 5:193-250. Donald, W.W. 1990. Primary tillage for foxtail barley (Hordeum jubatum) control. Weed Technol. 4:318-321. Donald, W.W., Nalewaja, J.D. 1990. Northern great plains. Chapter 5. In: W.W. Donald (Ed.) Systems of Weed Control in Wheat in North America. Weed Science Society of America. Monograph No. 6, Champaign, IL. pp. 90-126. Donald, W.W. 1990. Introduction. Chapter 1. In: W.W. Donald (Ed.) Systems of Weed Control in Wheat in North America. Weed Science Society of America. Monograph No. 6, Champaign, IL. pp. 1-10. Donald, W.W. 1990. Difenzoquat. Chapter 14. In: W.W. Donald (Ed.) Systems of Weed Control in Wheat in North America. Weed Science Society of America. Monograph No. 6, Champaign, IL. pp. 298-320. Donald, W.W. 1990. Sulfonylurea herbicides. Chapter 21. In: W.W. Donald (Ed.) Systems of Weed Control in Wheat in North America. Weed Science Society of America. Monograph No. 6, Champaign, IL. pp. 423-476. Ghidey, F., Alberts, E.E. 1990. Residue decomposition and management component of WEPP. ASAE. Paper 90-2556:22 Hjelmfelt, A.T., Blanchard, P.E., Heidenreich, L.K., Kitchen, N.R. 1990. MO MSEA site background information. EOS, Trans. Am. Geophysical Union Claypan Soils. 71(43):1331. Hjelmfelt, A.T., Kramer, L.A. 1990. Influence of tillage on hydrology in western Iowa. Proc. Watershed planning...action. Am. Soc. Civil Engrs. R.R. Riggins, E.B. Jones, R. Singh and P.A. Rechard, ed. pp. 405-414. Kramer, L.A., Alberts, E.E., Hjelmfelt, A.T., Gebhardt, M.R. 1990. Effect of soil conservation systems on ground water nitrate levels from three corn-cropped watersheds in SW IA. Groundwater Management. 1:175-189.

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Kremer, R.J., Begonia, M.F.T., Stanley, L., Lanham, E.T. 1990. Characterization of rhizobacteria associated with weed seedlings. Applied and Environmental Microbiology. 56(6):1649-1655. Lerch, R.N., Barbarick, K.A., Westfall, D.G., Follett, R.H., McBride, T.M., Owen, W.F. 1990. Sustainable rates of sewage sludge for dryland winter wheat production I. Soil nitrogen and heavy metals. J of Production Agriculture. 3(1):60-65. Lerch, R.N., Barbarick, K.A., Westfall, D.G., Follett, R.H., McBride, T.M., Owen, W.F. 1990. Sustainable rates of sewage sludge for dryland winter wheat production II. Production and Income. J of Production Agriculture. 3(1):60-65. Nearing, M.A., Alberts, E.E., Laflen, J.M. 1990. Prediction technology for soil erosion by water: status and research needs. Soil Science Soc. Am. J. 54:1702-1711. Neibling, W.H., Thompson, A., Pfost, D.L., Alberts, E.E. 1990. Potential reduction in surface and subsurface losses of agricultural fertilizers from claypan soils under ridge tillage management. Proc. of Water Quality Conf. MO Agric. Exp. Sta. Special Report 428. Columbia, MO. pp. 7-13. Reed, J.P., Kremer, R.J., Keaster, A.J. 1990. Spectrophotometric methodologies for predicting and studying enhanced degradation. American Chemical Society Symposium Series 426. pp. 240-248. Sudduth, K.A., Hummel, J.W., Funk, R.C. 1990. Soil organic matter sensing for precision herbicide application. Standard Technical Publication 1078. American Society for Testing and Materials. pp. 112-125.

1989 Alberts, E.E., Weltz, M.A., Ghidey, F. 1989. Plant growth component. In: Lane, L. J. and Nearing, M. A. (eds). water erosion prediction project landscape profile model documentation. NSERL Rep. 2 Natl. Soil Erosion Res. Lab., USDA-ARS, W. Lafayette, IN. Pp 8.1-8.38. (Book Chapter) Alberts, E.E., Ghidey, F. 1989. WEPP-Plant growth, residue decomposition, and management practices for cropland. SWCS Annual Meeting, Edmonton Alberts, Canada. 27 pp. Alberts E.E., Laflen, J.M., Rawls, W.J., Simanton, J.R., Nearing, M.A. 1989. Soil component. In Lane, L.J. and Nearing, M.A. (editors) Water erosion prediction project landscape profile model documentation. NSERL Rep. 2. Natl. Soil erosion Res. Lab., USDA-ARS, W. Lafayette, IN. pp. 6.1-6.15. (Book chapter). Beuselinck, P.R., Kremer, R.J., and McGraw, R.L. 1989. A survey of microorganisms associated with birdsfoot trefoil seed. J of Applied Seed Production. Paper No. 10459. Ghidey, F., Alberts, E.E. 1989. Plant growth component of WEPP. ASAE Paper 89-2625. p. 20 Hummel, J.W., Levan, M.A., Sudduth, K.A. 1989. Minirhizotron installation in heavy soils. Trans. of the Am. Soc. of Engr. 323):770-776. Kremer, R.J., Spencer, N.R. 1989. Impact of a seed feeding insect and microorganisms on velvetleaf (Aubtilon theophrasti) seed viability. Weed Tech. 37:211-216. Kremer, R.J., Spencer, N.R. 1989. Interaction of insects, fungi, and burial on velvetleaf (abutilon theophrasti) seed viability. Weed Techno. 3:322-328. Kremer, R.J., Schulte, L.K. 1989. Influence of chemical treatment and Fusarium oxysporum on velvetleaf (Abutilon theophrasti). Weed Techno. 3:369-374.

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LaBerge, G.A., Kremer, R.J. 1989. Effects of Velvetleaf plant residues on seedling growth and soil microbial activity. Bull. Environ. Contam. Toxicol. 43:421-427. Peterson, H.L., Kremer, R.J. 1989. Compatibility of rhizobia and fertilizers combined as legume inocula. Mircen J. 5:95-104. Reed, J.P., Keaster, A.J., Kremer, R.J., Kerr, H.D. 1989. Activities and degradation of several insecticides and herbicides in soils poised for enhanced carbamate and thiocarbamate degradation. J. Environ. Sci. Health. B24(1):23-35. Reed, J.R., Keaster, A.J., Kremer, R.J., Kerr, H.D. 1989. Microbial degradation of some soil-applied insecticides, herbicides and insecticide-herbicide combinations. Bull. Environ. Contam. Toxicol. 42:676-681. Reed, J.P., Keaster, A.J., Kremer, R.J., Krause, G.F. 1989. Synergistic and antagonistic responses of soil insecticide-herbicide combinations for corn rootworm, Diabrotica Spp. Control. J. Environ. Sci. Health. B24(4):325-334. Sudduth, K.A., Hummel, J.W., Levan, M.A. Zhu, Gantzer, et al, 1989. Widespan vehicle for data collection in tillage research. ASAE. 32(2):367-372. Zhu, J.C., Gantzer, C.J., Anderson, S.H., Alberts, E.E. Beuselinck, P.R. 1989. Runoff, soil, and dissolved nutrient losses from no-till soybean with winter cover crops. Soil Sci. Soc. Am. J. 53:1210-1214

1988 Carlson, S.J., Donald, W.W. 1988. Glyphosate effects on Canada thistle (Cirsium arvense) roots, root buds, and shoots. Weed Research. 28:37-45. Donald, W.W. 1988. Clopyralid effects on shoot emergence, root biomass, and secondary shoot regrowth potential of Canada thistle (Cirsium arvense). Weed Science. 36:804-809. Gebhardt, M.R. 1988. Herbicide application technology. In: Electrostatic Spraying, McWhorter, C.G. and M. R. Gebhardt, eds. Weed Sci. Soc. of America. Champaign, IL. pp. 137-144. Gebhardt, M.R. 1988. Rotary disk atomization. Weed Tech. 2:106-113. Gebhardt, M.R., Kapusta, G. 1988. Herbicide application technology. In: Rotary Atomization. McWhorter, C.G. and Gebhardt, M.R, eds. Weed Sci. Soc. of America. Champaign, IL. pp. 111-121. Gebhardt, M.R., McWhorter, C.G. 1988. Herbicide application technology. In: Introduction to Herbicide Application Technology. McWhorter, C.G. and M. R. Gebhardt, eds. Weed Sci. Soc. of America. Champaign, IL. pp. 1-8. Kramer, L.A., Alberts, E.E. 1988. Effect of three tillage systems on corn and soybean growth and grain yield. ASAE. Paper MCR-88-111. 18 pp. Kramer, L.A., Alberts, E.E. 1988. Runoff and soil loss by cropstage from three tillage systems for corn and soybeans. ASAE. Paper 88-2124. 21 pp. Lane, L.J., Schertz, D.L., Alberts, E.E., Laflen, J.M., Lopes, V.L. 1988. The U.S. Natl. project to develop improved erosion prediction technology to replace the USLE. Internat. Assoc. of Hydrological Sci. 20 pp. (Camera ready copy). McWhorter, C.G., Gebhardt, M.R. 1988. Herbicide application technology. Weed Sci. Soc. of Amer., Champaign, IL.

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Paszkowski, W. L., Kremer, R. J. 1988. Biological activity and tentative identification of flavonoid components in velvetleaf (Abutilon theophrasti Medik.) seed coats. J. of Chemical Ecology. 14(7):1573-1582.

1987 Alberts, E.E., Holzhey, C.S., West, L.T., Nordin, J.O. 1987. Soil selection: USDA-Water Erosion Prediction Project (WEPP). ASAE Paper 87-2542. 16 pp. Alberts, E.E., Laflen, J.M., Spomer, R.G. 1987. Between year variation in soil erodibility determined by rainfall simulation. ASAE. 30(4):982-987. Alberts, E.E., Spomer, R.G. 1987. Corn grain yield response to topsoil depth deep loess soil. ASAE. 30(4):977-981. Donald, W.W., Zimdahl, R.L. 1987. Persistence, germinability, and distribution of jointed goatgrass (Aegilopis cylindrica) seed in soil. Weed Science. 35:149-154. Donald, W.W. 1987. Effect of soil-applied chlorsulfuron on Canada thistle (Cirsium arvense) root and root bud growth. Weed Technology. 1:154-161. Gantzer, C.J., Buyanovsky, G.A., Alberts, E.E., Remley, P.A. 1987. Effects of soybean and corn residue decomposition on soil strength and splash detachment. Soil Sci. Soc. of America J. 51(1):202-206. Hjelmfelt, A.T. Curve numbers in urban hydrology. In: Proc. of IV Int. Conf. in Urban Storm Drainage, XXII Congress Internat. Association for Hydraulic Research, August 31 - September 4, 1987. pp. 73-78. Kramer, L.A. Precipitation characteristics from variable, hourly and daily data bases. Trans. ASAE. 30(6):1706-1712. Kremer, R.J. 1987. Identity and properties of bacteria inhabiting seeds of selected broadleaf weed species. Microbial Ecology.14:29-37. Soper, D.Z., Kremer, R.J., Dunn, J.H. 1987. Inhibition of microbial growth by extracts from two turfgrass species. Trans. Mo. Academy of Sci. P. 125-129. Spomer, R.G., Mahurin, R.L. 1987. Landform changes determined photogrammetrically on deep loess soils. ASAE. 30(1):153-157. West, L.T., Alberts, E.E., Holzhey, C.S., Dunnigan, L. 1987. Soil measurements: USDA-Water Erosion Prediction Project (WEPP). ASAE. Paper 87-2543. 15 pp.

1986 Alberts, E.E., Laflen, J.M., Spomer, R.G. 1986. Temporal variation in soil erodibility determined by rainfall simulation. ASAE. Paper 86-2040. 17 pp. Carlson, S.J., Donald, W.W. 1986. A washer for removing thickened roots from soil. Weed Science. 34:794-799. Gilley, J.E., Finkner, S.C., Spomer, R.G., Mielke, L.N. 1986. Runoff and erosion as affected by corn residue: Part I. Total Losses. ASAE. 29(1):157-160. Gilley, J.E., Finkner, S.C., Spomer, R.G., Mielke, L.N. 1986. Runoff and erosion as affected by corn residue: Part II. Rill and interrill components. ASAE. 29(1):161-164.

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Gilley, J.E., Finkner, S.C., Spomer, R.G., Mielke, L.N. 1986. Size distribution of sediment as affected by corn residue. Trans. ASAE. 29(5):1273-1277. Hjelmfelt, A.T. 1986. Estimating peak runoff from field-size watersheds. J. of the American Water Resources Association. 22(2):267-274. Hjelmfelt, A.T., Kramer, L.A., Spomer, R.G. 1986. Role of large events in average soil loss. In: Proc. of the Fourth Federal Interagency Sedimentation Conf. I:3-1 -- 3-9. Kramer, L.A. 1986. Runoff and soil loss by cropstage from conventional and conservation tilled corn. Trans. ASAE. 29(3):774-779. Kramer, L.A., Alberts, E.E. 1986. C factors for corn under changing management. Trans. ASAE. 29(6):1590-1596. Rausch, D.L. 1986. Spillway design affects reservoir water quality. Trans. ASAE. 29(2):462-466 & 472. Spomer, R.G., Hjelmfelt, A.T. 1986. Concentrated flow erosion on conventional and conservation tilled watersheds. Trans. ASAE. 29(1):124-127 & 134. Spomer, R.G., Mahurin, R.L., Piest, R.F. 1986. Erosion, deposition and sediment yield from dry creek basin, Nebraska. Trans. ASAE. 29(2):484-488. Van der Poel, P., Spomer, R.G., Piest, R.F. 1986. Slope indicator measurements of subsurface movement in gully walls. Trans. ASAE. 29(4):982-987. Wendt, R.C., Alberts, E.E., Hjelmfelt, A.T. 1986. Variability of runoff and soil loss from fallow experimental plots. Soil Sci. Soc. of Am. J. 50(3):730-736.

1985 Alberts, E.E., Spomer, R.G. 1985. NO3-N movement in deep loess soils. ASAE. Paper 85-2030. 17 pp. Alberts, E.E., Spomer, R.G. 1985. Dissolved nitrogen and phosphorus in runoff from watersheds in conservation and conventional tillage. J. of Soil and Water Conservation. 40(1):153-157. Alberts, E.E., Wendt, R.C. 1985. Influence of soybean and corn cropping on soil aggregate size and stability. Soil Sci. Soc.of America J. 49(6):1534-1537. Alberts, E.E., Wendt, R.C., Burwell, R.E. 1985. Corn and soybean cropping effects on soil losses and C factors. Soil Sci. Soc. of America J. 49(3):721-728. Donald, W. W., Hoerauf, R.A. 1985. Enhanced germination and emergence of dormant wild mustard (Sinapsis arvensis) seed by two substituted phthalimides. Weed Sci. 33:894-902. Gantzer, C.J., Alberts, E.E., Bennett, W.H. 1985. An electronic discriminator to eliminate the problem of horizontal raindrop drift. Soil Sci. Soc. of America J. 49(1):211-215. Ghidey, F., Gregory, J.M., McCarty, T.R., Alberts, E.E. 1985. Residue decay evaluation and prediction. Trans. ASAE. 28(1):102-105. Gregory, J.M., McCarty, T.R., Ghidey, F., Alberts, E.E. 1985. Derivation and evaluation of a residue decay equation. Trans. ASAE. 28(1):98-101 & 105. Hawkins, R.H., Hjelmfelt, A.T., Zevenbergen, A.W. 1985. Runoff probability, storm depth, and curve numbers. J. of Irrigation and Drainage Engineering, ASCE. 111(4):330-340.

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Hjelmfelt, A.T. 1985. Negative outflows from Muskingum flood routing. J. of Hydraulic Engineering. 111(6):1010-1014. Hjelmfelt, A.T. 1985. Unit hydrograph as a discrete linear filter. Civil Engineering for Practicing and Design Engineers. 4:459-476. Hjelmfelt, A.T., Spomer, R.G., Kramer, L.A. 1985. Discharge measurement problems for field size agricultural catchments. Proc. of the XXI Congress of Internat. Assoc. for Hydraulic Research, Melbourne, Australia. 5:164-167. Rausch, D.L., Pfost, D., Caldwell, L.W. 1985. Design criteria for bottom-withdrawal (Lake-Cleaning) spillway. Univ. of Missouri Agricultural Guide 1531. Columbia, MO. Settergren, C., Morris, M., Hjelmfelt, A.T., Henderson, G. 1985. Synthetic unit hydrographs for Ozark watersheds. pp. 140-145. In Proc. of Symposium sponsored by Committee on Watershed Management/Irrigation & Drainage Div., ASCE Convention, Denver, CO. Spomer, R.G., McHenry, J.R., Piest, R.F. 1985. Sediment delivery and deposition estimated using cesium-137 tracer. Trans. ASAE. 28(3):767-772. Wendt, R.C., Burwell, R.E. 1985. Runoff and soil losses for conventionally reduced, and no-till corn. J. of Soil & Water Conservation. 40(5):450-454.

1984 Donald, W.W. 1984. Vernalization requirements for flowering of jointed goatgrass (Aegilops cylindrica). Weed Sci. 32:631-637. Donald, W.W. 1984. Chlorsulfuron effects on shoot growth and root buds of Canada thistle (Cirsium arvense). Weed Sci. 32:42-50. Heinemann, H.G. 1984. Reservoir trap efficiency. Chapter 8 In Erosion and Sediment Yield: Some Methods of Measurement and Modeling. R. F. Hadley and D. E. Walling, eds. Geo. Books, Norwich, England, pp. 201-218. Hjelmfelt, A.T. 1984. Convolution and the Kinematic wave equations. J. EOS Trans., American Geophysical Union. 65(45):874. Hjelmfelt, A.T., Burwell, R. E. 1984. Spatial variability of runoff. J. of Irrigation and Drainage Engineering, ASCE 110(1):46-54. Hjelmfelt, A.T., Spomer, R.G. 1984. Nonlinear runoff model for field-size areas. In: Proc. of the Specialty Conf. sponsored by Irrigation & Drainage Div. ASCE, Flagstaff, Arizona, July 24-26, 1984, pp. 632-641. Mueller, D.H., Daniel, T.C., Wendt, R.C. 1984. Phosphorus losses as affected by tillage and manure application. Soil Sci. Soc. of America J. 48(4):901-905. Mueller, D.H., Wendt, R.C., Daniel, T.C. 1984. Soil and water losses as affected by tillage and manure application. Soil Sci. Soc. of America J. 48(4): pp.896-900. Nelson, C.J., Rausch, D.L. 1984. Managing irrigated alfalfa. In: Proc. of The Sixteenth Annual Irrigation Conf., Columbia, MO. pp. 100-108. Rausch, D.L., Heinemann, H.G. 1984. Measurement of reservoir sedimentation. Chapter 7 In Erosion and Sediment Yield: Some Methods of Measurement and Modeling. R. F. Hadley and D. E. Walling, eds. Geo. Books, Norwich, England. pp. 179-200.

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Rausch, D.L., Nelson, C.J. 1984. Drainage and subirrigation of a claypan soil. In: Proc. of a Conf. on Management Techniques for Water and Related Resources, April 4-6, 1984, Carbondale, IL, Special Report No. 14, American Water Resources Association, IL Section. pp. 172-183. Rausch, D.L., Pfost, D., Caldwell, L.W. 1984. Operation of a bottom-withdrawal (lake-cleaning) spillway. Univ. of Missouri, Columbia Agricultural Guide 1530. Spomer, R.G., Hjelmfelt, A.T. 1984. Soil moisture response to cropping and tillage on western Iowa loess soils. Trans. ASAE. 2(3): pp. 822-826. Spomer, R.G., Mahurin, R.L. 1984. Time-lapse remote sensing for rapid measurement of changing landforms. J. of Soil & Water Conservation. 39(6):397-401. Van Liew, M.W., Saxton, K.E. 1984. Dynamic flow resistance for hydrologic simulations. J. of Hydraulic Engineering. 110(12):1719-1732. Wendt, R.C., Alberts, E.E. 1984. Estimating labile and dissolved inorganic phosphate concentrations in surface runoff. J. of Environmental Quality. 13(4):613-618.

1983 Alberts, E.E., Wendt, R.C., Piest, R.F. 1983. Physical and chemical properties of eroded soil aggregates. Trans. ASAE. 26(2):465-471. Burwell, R.E., Kramer L.A. 1983. Long-term annual runoff and soil loss from conventional and conservation tillage of corn. J. of Soil and Water Conservation. 38(3):315-319. Ghidey, F., Gregory, J.M., McCarty, T.R., Alberts, E.E. 1983. Residue decay evaluation for soil conservation. Mid Central Meeting American Society of Agricultural Engineers, St. Joseph, Missouri, March 11-12, 1983. ASAE, St. Joseph, Michigan. Paper No. 83-102. Gregory, J.M., McCarty, T.R., Ghidey, F., Alberts, E.E. 1983. Residue decay equation for use in evaluating soil conservation systems. Mid Central Meeting American Society of Agricultural Engineers, St. Joseph, Missouri, March 11-12, 1983. ASAE, St. Joseph, Michigan. Paper No. 83-101. Hjelmfelt, A.T. 1983. Curve numbers: a personal interpretation. 1983. Proc. of the Specialty Conf. on Advances in Irrigation and Drainage: Surviving External Pressures. ASCE/Jackson, Wyoming. pp. 208-215. Hjelmfelt, A.T. 1983. Kinematic wave theory: A nonmathematical description. Civil Engineering for Practicing and Design Engineers. 2(3):269-273. Hjelmfelt, A.T., Kramer, L.A. 1983. Antecedent moisture condition probabilities by Gray et al. (Discussion). J. of Irrigation and Drainage Engineering. 109(2):300. Spomer, R.G., Hjelmfelt, A.T. 1983. Snowmelt runoff and erosion on Iowa loess soils. Trans. ASAE. 26(4):1109-1111 & 1116. Van Liew, M.W. 1983. Dynamic simulation of water and sediment discharge from agricultural watersheds. Ph.D. Dissertation. Washington State Univ., Pullman, Washington. Van Liew, M.W., Saxton, K.E., Wendt, R.C. 1983. Slope steepness and incorporated residue effects on rill erosion. Trans. ASAE. 26(2):465-471. Wendt, R.C. 1983. Soil and water factors affecting EPC. In: Proc. of the Natural Resources Modeling Symposium, Pingree Park, Colorado, October 16-21, 1983. USDA-ARS ARS-30 April 1985, pp. 151-154.

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1982 Burwell, R.E., Kramer, L.A. 1982. Long-term annual runoff and erosion frequency distributions for corn using conventional and conservation tillage. In Proc. of Conservation Tillage Seminar, College of Agriculture, Univ. of Missouri, Columbia, October 12, 1982, pp. 87-98. Daniel, T.C., Wendt, R.C., McGuire, P.E., Stoffel, D. 1982. Nonpoint source loading rates from selected land uses. Water Resources Bulletin. 18(1):117-120. Gregory, J.M., McCarty, T.R., Ghidey, F., Pfost, D.L. 1982. Tillage equation for residue management. Winter Meeting American Society of Agricultural Engineers, Chicago, Illinois, December 14-17, 1982. ASAE, St. Joseph, Michigan. Paper No. 82-1513. Hjelmfelt, A.T. 1982. Curve number as infiltration method (closure), J. Hydraulics Division, ASCE 108 (HY 10):1241. Hjelmfelt, A.T. 1982. Closure to “Empirical investigation of the curve number technique”. J. Hydraulics Division, ASCE. 108(4):613-616. Hjelmfelt, A.T. 1982. Overland flow from time-distributed rainfall (closure). J. Hydraulics Division, ASCE. 108(10):1243-1245. Hjelmfelt, A.T. 1982. Surface Hydrology: II - distribution of raindrops (discussion of paper by D. Zaslavsky and G. Siani), J. Hydraulics Division, ASCE, 108(1):158-160. Hjelmfelt, A.T., Kramer, L.A., Burwell, R.E. 1982. Curve numbers as random variables. Proc Int. Symp. On Rainfall-Runoff Modeling. Water Resources Publications, Littleton, Colorado. pp. 365-370. Hjelmfelt, A.T., Staff. 1982. North Central Watershed Research Unit IN: The quality of agricultural research service watershed and plot data. C. W. Johnson, D. A. Farrell and F. W. Blaisdell, Eds., USDA, Agricultural Research Service, ARM-W-31. Oakland, CA. pp. 74-79. Spomer, R.G., Piest, R.F. Soil productivity and erosion of Iowa loess soils. Trans. of the ASAE. 25(5):1295-1299. Wendt, R.C., Burwell, R.E. 1982. Influence of tillage and soil cover management on runoff, soil losses and corn yields from a central Missouri claypan soil. In Proc. of Conservation Tillage Seminar, D. E. Ervin (ed.), College of Agriculture, Univ. of Missouri, Columbia, October 12, 1982, pp. 78-86.

1981 Alberts, E.E., Moldenhauer, W.C. 1981. Nitrogen and phosphorus transported by eroded soil aggregates. Soil Sci. Soc. Am. J. 45(2):391-396. Alberts, E.E., Neibling, W.H., Moldenhauer, W.C. 1981. Transport of sediment nitrogen and phosphorus through cornstalk residue strips. Soil Sci. Soc. Am. J. 45(6):1177-1184. Alberts E.E., Wendt, R.C. Piest, R.F. 1981. Physical and chemical properties of eroded soil aggregates. ASAE. Paper 81-2046. pp.18 Hjelmfelt, A.T. 1981. Overland flow from time-distributed rainfall. J. Hydraulics Division, ASCE 107(HY2):227-238.

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Knox, H.T., Muhs, P.R., Poggensee, R.L. 1981. Water-quality rainfall sampler. J. of Agric. Eng. 62(11):18-19. Mueller, D. H., Daniel, T.C.,Wendt,R. C. 1981. Conservation Tillage: Best Management Practice for Nonpoint Runoff. Environmental Management. 5:33-53. Piest, R.F., Crosby, C.T., Spomer, R.G. 1981. Improved techniques for control of gullying. In: Proc. of the Specialty Conf. Water Forum '81, I:664-672. Rausch, D.L. 1981. Bottom-withdrawal spillway improves water quality. In ASCE Proc. of the Symposium on Surface Water Impoundments, June 2-5, 1980, II:1043-1053. Rausch, D.L., Schreiber, J.D. 1981. Sediment and nutrient trap efficiency of a small flood-detention reservoir. J. of Environ. Quality. 10(3):288-293. Roloff, G., Bradford, J.M., Scrivner, C.L. 1981. Gully development in the deep loess hills region of central Missouri. 1981. J. of Soil Science Society of America. 45(1):119-123. Schreiber, J.D., Rausch, D.L., Olness, A. 1981. Phosphorus concentrations and yields in agricultural runoff as influenced by a small flood detention reservoir. In: ASCE Proc. of the Symposium on Surface Water Impoundments, I:303-312. Spomer, R.G., Hjelmfelt, A.T., Piest, R.F. 1981. Conservation aspects of selected tillage systems on western Iowa cornfields. In: ASAE Proc. Conf. on Crop Production with Conservation in the 80's. ASAE Pub. 7-81, 216-227. Sudar, R.A., Saxton, K.E., Spomer, R.G. 1981. A predictive model of water stress in corn and soybeans. Trans. ASAE. 24(1):97-102. Tabatabai, M.A., Burwell, R.E., Ellis, B.G., Keeney, D.R., Logan, T.J., Nelson, D.W., Olson, R.A., Randall, G.W., Timmons, D.R., Verry, E.S., White, E.M., Rausch, D.L. 1981. Nutrient concentrations and accumulations in precipitation over the north central region. pp. 111-142. In: North Central Regional Research Publication 282. Iowa Agriculture and Home Economics Experiment Station Research Bulletin 594. Ward, A.D., Rausch, D.L., Haan, C.T., Heinemann, H.E., Daniel, T.C. 1981. A verification study on a reservoir sedimentation model. Trans. ASAE. 24(2):340-346 & 352. Wendt, R.C., Corey, R.B. 1981. Available P determination by equilibration with dilute SrC12. Communications in Soil Science and Plant Analysis. 12(6):557-568.

1980 Alberts, E.E., Moldenhauer, W.C., Foster, G.R. 1980. Soil aggregates and primary particles transported in rill and interrill flow. Soil Sci. Soc. Am. J. 44(3):590-595. Alberts, E.E., Shrader, W.D. 1980. Cornstalk decomposition on a till-planted watershed. Agron. J. 72:709-712. Bradford, J.M., Piest, R.F. 1980. Erosional development of valley-bottom gullies in the upper midwestern United States, IN: Thresholds in Geomorphology, D. R. Coates and J. D. Vitek, eds. Dowden & Culver, Stroudsburg, PA for Geo. Allen & Unwin, Ltd., London, Boston & Sydney. pp. 75-101. Daniel, T.C., Mueller, D.H., Wendt, R.C., Jackson, G. 1980. Conservation tillage for corn. Univ. of Wisconsin Extension Publication No. A3091. pp.16. Daniel, T.C., Wendt, R.C., McGuire, P.E., Stoffel, D. 1980. Nonpoint source loading rates from selected land uses. American Society of Agricultural Engineers Conf., June 1980. Paper No. 80-2015.

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Foster, G.R., Neibling, W.H., Davis, S.S., Alberts, E.E. 1980. Modeling particle segregation during deposition by overland flow. pp. 184-195. Proc. of the Hydrologic Transport Modeling Symposium, American Society of Agricultural Engineers Conf., Dec. 1979. ASAE. pp.4-80. Hjelmfelt, A.T. 1980. Curve-number procedure as infiltration method. J. of the Hydraulics Division, Proc. ASCE 106(HY6):1105-1123. Hjelmfelt, A.T. 1980. Empirical investigation of curve number technique. J. of the Hydraulics Division, Proc. ASCE 106(HY9):1471-1476. Hjelmfelt, A.T. 1980. Time distribution of clock hour rainfall. Chapt. 1 in CREAMS--A Field Scale Model for Chemicals, Runoff and Erosion from Agricultural Management Systems. Vol. III: Supporting Documentation. W. G. Knisel, Ed., USDA, Conservation Research Report No. 26, pp. 379-385. Hjelmfelt, A.T., Amerman, C.R. 1980. The mathematical basin model of Merrill Bernard. Proc. Internat. Symposium on the Influence of Man on the Hydrological Regime, Helsinki. IAHS-AISH Publ. No. 130, pp. 343-349. Kramer, L.A., Burwell, R.E. 1980. Land use treatment effects on clay pan soil runoff and erosion. American Society of Agricultural Engineers Conf., June 1980. ASAE. Paper No. 80-2016. Little, W.C., Piest, R.F., Robinson, A.R. 1980. SEA research program for channel stability and gully control. Trans. ASAE. 23(2):362-365. Piest, R.F., Grissinger, E.H. 1980. Gully erosion. Chapter 9 in CREAMS - A Field Scale Model for Chemicals, Runoff and Erosion from Agricultural Management Systems. Vol. III: Supporting Documentation. Spomer, R.G., Hjelmfelt, A.T., Asce, M., Piest, R.F. 1980. Conservation aspects of selected tillage systems on western Iowa cornfields. Proc. ASAE. 7-81:216-227. Knisel, W.G.,ed., USDA, Conservation Research Report No. 26, pp. 455-462. Wendt, R.C., Corey, R.B. 1980. Phosphorus variations in surface runoff from agricultural lands as a function of land use. J. Environmental Quality. 9(1):130-136.

1979 Alberts E.E. 1979. The nitrogen and phosphorus content of eroded soil aggregates and sediment. Purdue Univ. pp.100 (Thesis) Amerman, C.R., ed. 1979. Infiltration research planning workshop. Oct. 1977. Part I: State of the Art Reports. USDA-SEA ARM-NC-4. pp. 128 Amerman, C.R. 1979. Rainfall simulation as a research tool in infiltration. In: USDA-SEA ARM-W-lO, Proc. of the Rainfall Simulator Workshop, Tucson, Arizona, March 7-9, 1979. pp. 85-89. Amerman, C.R. 1979. Status of infiltration research and measurement in the United States, 1977. IN: ARM-NC-4, Infiltration Research Planning Workshop, Part I: State of the Art Reports. pp. 102-128. Daniel, T.C., Wendt, R.C., Madison, F.W. 1979. Nonpoint pollution: Sediment and phosphorus in agricultural runoff. Univ. of Wisconsin Extension Publication No. G2966. Daniel, T.C., Wendt, R.C., McGuire, D.E., Stoffel, D.A. 1979. Comparison of composite sampling techniques for monitoring runoff. Trans. ASAE 22:1310-1312. Dendy, F.E., Allen, P.B., Piest, R.F. (Principal Contributors) 1979. Chapter 4. Sedimentation. In: Field Manual for Research in Agricultural Hydrology, Agricultural Handbook No. 224, 239-394.

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Holt, R.F., Timmons, D.R., Burwell, R.E. 1979. Water quality obtainable under conservation practices. Chapt. 6, Universal Soil Loss Equation: Past, Present, and Future. SSSA Special Publication Number 8. Proc. of a Symposium sponsored by Div. S-6 of the SSSA. pp. 45-53. Huettl, P.J., Wendt, R.C., Corey, R.B. 1979. Prediction of algal-available phosphorus in runoff suspensions. J. Environ. Qual. 8: 130-132. Neibling, W.H., Alberts, E.E. 1979. Composition and yield of soil particles transported through sod strips. ASAE. Paper 79-2065. (Mimeo handout). Piest, R.F., Ziemnicki, S. 1979. Comparative erosion rates of loess soils in Poland and Iowa. Trans. ASAE. 22(4):822-827, 833. Saxton, K.E., Bluhm, G.C. 1979. Predicting crop water stress by soil water budgets and climatic demand. American Society of Agricultural Engineers, Dec. 1979. Paper No. 79-2511. Schreiber, J.D., Rausch, D.L. 1979. Suspended sediment-phosphorus relationships for the inflow and outflow of a flood detention reservoir. J. Environ. Qual. 8(4):510-514. Smith, G.E., Blanchar, R.W., Burwell, R.E. 1979. Fertilizers and pesticides in runoff and sediment from claypan soil. Completion Report USDA-OWRT-14-31-0001-5085 B-099-MO. pp. 60 Spomer, R.G., Piest, R.F., Poggensee, R.L., Brophy, J.A. 1979. Erosion on the Sheyenne river delta, North Dakota. In Specialty Conf. on Irrigation and Drainage in the Nineteen-Eighties, ASCE/Albuquerque, New Mexico, July 17-70, 1979, pp. 401-414.

1978 Alberts, E.E., Schuman, G.E., Burwell, R.E. 1978. Seasonal runoff losses of nitrogen and phosphorus from Missouri valley loess watersheds. J. Environ. Qual. 7(2):203-208. Bradford, J.M., Piest, R.F., Spomer, R.G. 1978. Failure sequence of gully headwalls in western Iowa. Soil Sci. Soc. Amer. J. 42(2):323-328. Hjelmfelt, A.T. Amazon basin hydrometeorology. 1978. J. of the Hydr. Div.,ASCE, 104(HY6):887-897, Proc. Paper 13825. Hjelmfelt, A.T. 1978. Influence of infiltration on overland flow. J. Hydrol. 6:179-185. Whitaker, F.D., Heinemann, H.G., Burwell, R.E. 1978. Fertilizing corn adequately with less nitrogen. J. Soil and Water Conserv. 33(1):28-32.

1977 Alberts, E.E., Burwell, R.E., Schuman, G.E. 1977. Soil nitrate-nitrogen determined by coring and solution extraction techniques. Soil Sci. Soc. Am. J. 41(1):90-92. Amerman, C.R. 1977. Tillage and hydrology. In: ARS-NC-57, Research progress and needs--conservation tillage, pp. 73-81. Amerman, C.R., Monke, E.J. 1977. Soil water modeling II: On sensitivity to finite difference grid spacing. Trans. ASAE. 20(3):478-484.

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Bradford, J.M., Blanchar, R.W. 1977. Profile modification of a Fragiudalf to increase crop production. Soil Sci. Soc. Amer. J. 41(1):127-131. Bradford, J.M., Piest, R.F. 1977. Gully wall stability in loess-derived alluvium. Soil Sci. Soc. Amer. J. 41(1):115-122. Burwell, R.E. 1977. Nutrient loss research. In: ARS-NC-57, Research progress and needs--conservation tillage, pp. 28-34. Burwell, R.E., Schuman, G.E., Heinemann, H.G., Spomer, R.G. 1977. Nitrogen and phosphorus movement from agricultural watersheds. J. Soil and Water Conserv. 32(5):226-230. Donald, W.W., Mirocha, C.J. 1977. Chitin as a measure of fungal growth in stored corn and soybean seed. Cereal Chemistry. 54(3):466-474. Heinemann, H.G., Rausch, D.L. 1977. Optimizing water quality using small reservoirs. Proc. 32nd Annual Meeting, SCSA, Richmond, Virginia. pp. 85-92. Olness, A., Rausch, D.L. 1977. Callahan reservoir: III. Bottom sediment- water-phosphorus relationships. Trans. ASAE. 20(2):291-297, 300. Piest, R.F., Elliott, L.S., Spomer, R.G. 1977. Erosion of the Tarkio drainage system, 1845-1976. Trans. ASAE. 20(3):485-488. Rausch, D.L., Schreiber, J.D. 1977. Callahan reservoir: I. sediment and nutrient trap efficiency. Trans. ASAE. 20(2):281-284, 290. Saxton, K.E., Schuman, G.E., Burwell, R.E. 1977. Modeling nitrate movement and dissipation in fertilized soils. Soil Sci. Soc. Amer. J. 41(2): 265-271. Saxton, K.E. 1977. Technology development and transfer for natural resources management. J. of Soil and Water Conservation. 32(3):123-125. Schreiber, J.D., Rausch, D.L., McDowell, L.L. 1977. Callahan reservoir: II. Inflow and outflow suspended sediment phosphorus relationships. Trans. ASAE. 20(2):285-290. Timmons, D.R., Verry, E.S., Burwell, R.E., Holt, R.F. 1977. Nutrient transport in surface runoff and interflow from an aspen-birch forest. J. Environ. Qual. 6(2):188-192.

1976 Amerman, C.R. 1976. Soil water modeling I: A generalized simulator of steady, two-dimensional flow. Trans. ASAE. 19(3):pp.466-470. Amerman, C.R. 1976. Waterflow in soils: a generalized steady-state, two-dimensional porous media flow model. ARS-NC-30. pp.62 Burwell, R.E., Schuman, G.E., Saxton, K.E., Heinemann, H.G. 1976. Nitrogen in subsurface discharge from agricultural watersheds. J. Environ. Qual. 5(3):325-329. Haden, J.D. 1976. Electrical event marker. Agric. Eng. 57(1):42. Heinemann, H.G., Rausch, D.L. 1976. Distribution of reservoir sediment--Iowa and Missouri deep loess hills. Proc. Third Fed. Inter-Agency Sed. Conf., Denver, Colorado. pp. 4-138-148.

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Mutchler, C.K., Burwell, R.E., Staples, L.C. 1976. Runoff and soil losses from Barnes soils in the northwestern corn belt. ARS-NC-36. p.16 Onstad, C.A., Piest, R.F., Saxton, K.E. 1976. Watershed erosion model validation for southwest Iowa. Proc. Third Fed. Inter-Agency Sed. Conf., Denver, Colorado. pp. 1-22-34. Piest, R.F., Beer, C.E., Spomer, R.G. 1976. Entrenchment of drainage systems in western Iowa and northwestern Missouri. Proc. Third Fed. Inter-Agency Sed. Conf., Denver, CO. pp. 5-48-60. Piest, R.F., Spomer, R.G., Muhs, P.R. 1976. A profile of soil movement on a cornfield. In: Soil erosion: Prediction and control, Soil Conserv. Soc. Amer., Ankeny, IA. pp. 160-166. Saxton, K.E., Ruff, J.F. 1976. Gaging sediment-laden flows with V-notch weirs. Proc. Third Fed. Inter-Agency Sed. Conf., Denver, CO. pp. 7-43-53. Schuman, G.E., Piest, R.F., Spomer, R.G. 1976. Physical and chemical characteristics of sediments originating from Missouri Valley loess. Proc. Third Fed. Inter-Agency Sed. Conf., Denver, CO. pp. 3-28-40. Spomer, R.G., Piest, R.F., Heinemann, H.G. 1976. Soil and water conservation with western Iowa tillage systems. Trans. ASAE. 19(1):108-112.

1975

Alberts, E.E. 1975. Decomposition of cornstalk residue on a mulch tilled watershed. Iowa State Univ. 75 pp. (Thesis) Amerman, C.R., Klute, A., Skaggs, R.W., Smith, R.E. 1975. Soil Water U. S. National. Report, 1971-1974, XVI General Assembly, Internat. Union of Geodesy and Geophysics, Grenoble, France. Reviews of Geophysics and Space Physics 13(3)451-454 and 496-505. Burwell, R.E., Schuman, G.E., Piest, R.F., Larson, W.E., Alberts, E.E. 1975. Sampling procedures for nitrogen and phosphorus in runoff. Trans. ASAE. 18(5):912-917. Burwell, R.E., Timmons, D.R., Holt, R.F. 1975. Nutrient transport in surface runoff as influenced by soil cover and seasonal periods. Proc. Soil Sci. Soc. Amer. Proc. 39(3):523-528. Heinemann, H.G., Piest, R.F. 1975. Soil erosion--sediment yield research in progress. EOS Trans., Amer. Geo. U. 56(3):149-159. Hjelmfelt, A.T., Piest, R.F., Saxton, K.E. 1975. Mathematical modeling of erosion on upland areas. Proc. 16th Congress of Inter. Assoc. for Hydr. Res., Sao Paulo, Brazil, 2(B-6):40-47. Piest, R.F. (as a member of the Committee on Preparation of the Text on Sedimentation Engineering) 1975. Contributed chapter IV, sediment sources and sediment yields, pp. 437-493, and participated in reviewing and editing of the entire book, Sedimentation Engineering, No. 54, pp.745 Piest, R.F. (as a member of the Task Committee on Urban Sedimentation Problems of the Committee on Sedimentation of the Hydraulics Division) 1975. Urban sediment problems: a statement on scope, research, legislation, and education. J. of the Hydr. Div., ASCE, lOl(HY4):329-340, Proc. Paper 11256. Piest, R.F., Bradford, J.M., Spomer, R.G. 1975. Mechanisms of erosion and sediment movement from gullies. In. ARS-S-40, "Present and Prospective Technology for Predicting Sediment Yields and Sources,"Proc. Sediment-Yield Workshop, USDA Sedimentation Laboratory, Oxford, Mississippi, Nov. 28-30, 1972, pp. 162-176. Piest, R.F., Bradford, J.M., Wyatt, G.M. 1975. Soil erosion and sediment transport from gullies. J. of the Hydr. Div., ASCE, lOl(HY1):65-80, Proc. Paper 11069.

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Piest, R.F., Kramer, L.A., Heinemann, H.G. 1975. Sediment movement from loessial watersheds. In ARS-S-40, "Present and Prospective Technology for Predicting Sediment Yields and Sources," Proc. Sediment-Yield Workshop, USDA Sedimentation Laboratory, Oxford, Mississippi, Nov. 28-30, 1972, pp. 130-141. Rausch, D.L., Heinemann, H.G. 1975. Controlling reservoir trap efficiency. Trans. ASAE. 18(6):1105-1108, 1113. Saxton, K.E. 1975. Sensitivity analyses of the combination evapotranspiration equation. Agric. Meteorology. Elsevier Scientific Publishing Company, Amsterdam. 15: 343-353. Schuman, G.E., McCalla, T.M., Saxton, K.E., Knox, H.T. 1975. Nitrate movement and its distribution in the soil profile of differentially fertilized corn watersheds. Proc. Soil Sci. Soc. Amer. 39(6):1192-1197.

1974

Burwell, R.E., Schuman, G.E., Piest, R.F., Spomer, R.G., McCalla, T.M. 1974. Quality of water discharged from two agricultural watersheds in Southwestern Iowa. Water Resour. Res. 10(2):359-365. Apr. 1974. Heinemann, H.G., Whitaker, F.D. 1974. Soil cover governs soil loss on United States claypan soils. Proc. Paris Symp., IAHS-AISH, pp. 109-113, Publ. 113. Kramer, L.A. 1974. Irrigation storage probabilities of small reservoir. J. of the Irrig. and Drain. Div., ASCE, lOO(IR4), Proc. Paper 10987, pp. 485-494. Piest, R.F., Bowie, A.J. 1974. Gully and streambank erosion. Proc. 29th Annual Meeting of the Soil Conserv. Soc. Amer. (Land Use: Persuasion or Regulation), Syracuse, NY. pp. 188-196. Rausch, D.L., Haden, J.D. 1974. Columbia spillway sampler. ARS-NC-16. 8 pp. Saxton, K.E., Johnson, H.P., Shaw, R.H. 1974. Modeling evapotranspiration and soil moisture. Trans. ASAE. 17(4):673-677. Saxton, K.E., Johnson, H.P., Shaw, R.H. 1974. Watershed evapotranspiration estimated by the combination method. Trans. ASAE. 17(4): pp.668-672. Schuman, G.E., Burwell, R.E. 1974. Precipitation nitrogen contribution relative to surface runoff discharges. J. Environ. Qual. 3(4):366-369. Smith, G.E., Whitaker, F.D., Heinemann, H.G. 1974. Losses of fertilizers and pesticides from claypan soils. EPA-660/2-74-068. 75 pp. Spomer, R.G., Heinemann, H.G. 1974. Improving water quality by soil conservation and management practices. Trans. Mo. Acad. Sci. Symp. 7-8:73-82.

1973 Bradford, J.M., Farrell, D.A., Larson, W.E. 1973. Mathematical evaluation of factors affecting gully stability. Proc. Soil Sci. Soc. Amer. 37(1):103-107. Hanson, C.L., Heinemann, H.G., Kuhlman, A.R., Neuberger, J.W. 1973. Sediment yields from small rangeland watersheds in western S. Dakota. J. of Range Management 26(3):215-219. Heinemann, H.G., Holt, R.F., Rausch, D.L. 1973. Sediment and nutrient research on selected corn belt reservoirs. IN: Man-made lakes, their problems and environmental effects. Geophysical Monograph, AGU, Washington, D.C. 17:381-386

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McKibben, J.S., Whitaker, F.D. 1973. Tilling various soil zones affects corn yields. Trans. ASAE. 16(3):404-406. Saxton, K.E. 1973. Runoff available for irrigation in the claypan area. Proc. Fifth annual Irrigation short course, Jan. 30, 1973, Univ. of Missouri, Columbia. Schuman, G.E., Burwell, R.E., Piest, R.F., Spomer, R.G. 1973. Nitrogen losses in surface runoff from agricultural watersheds on Missouri Valley loess. J. Environ. Qual. 2(2):299-302. Schuman, G.E., Spomer, R.G., Piest, R.F. 1973. Phosphorus losses from four agricultural watersheds on Missouri Valley loess. Proc. Soil Sci. Soc. Amer. 37(3):424-427. Spomer, R.G., Saxton, K.E., Heinemann, H.G. 1973. Water yield and erosion response to land management. J. Soil and Water Conserv. 28(4):168-171. Spomer, R.G., Shrader, W.D., Rosenberry, P.E., Miller, E.L. 1973. Level terraces with stabilized backslopes on loessial cropland in the Missouri Valley: A cost-effectiveness study. J. Soil and Water Conserv. 28(3):127-131. Timmons, D.R., Burwell, R.E., Holt, R.F. 1973. Nitrogen & phosphorus losses in surface runoff from agricultural land as influenced by placement of broadcast fertilizer. Water Resource Res. 9(3):658-667. Whitaker, F.D., Heinemann, H.G., Wischmeier, W.H. 1973. Chemical weed controls affect runoff, runoff erosion, and corn yields. J. Soil and Water Conserv. 28(4):174-176. Wyatt, G.M., Piest, R.F. 1973. How seasonal is erosion? Agrineer. Univ. of Mo. Agric. Ext. Div., Columbia. 2(8):30.

1972 Piest, R.F. (Task Committee on Preparation of Sedimentation Manual, Committee on Sedimentation of the Hydraulics Division.) 1972. Closure, Chapter IV. Sediment Sources and Sediment Yields. J. of the Hydr. Div., ASCE, Proc. Paper 8859, pp. 938-948. Piest, R.F., Bradford, J.M., Spomer, R.G. 1972. Mechanisms of erosion and sediment movement from gullies. Sediment Yield Workshop, November 28-30, Oxford, Mississippi. Piest, R.F., Kramer, L.A., Heinemann, H.G. 1972. Sediment movement from loessial watersheds. Sediment Yield Workshop, November 28-30, Oxford, Mississippi. Saxton, K.E. Level terraces are effective. 1972. Agrineer 1(11):43, Univ. of Mo. Ext. Div., Columbia. Whitaker, F.D., Moldenhauer, W.C., Saxton, K.E. 1972. Tillage and erosion research in the western corn belt. Conf. Proc: Tillage Practices for Improving Runoff Water Quality. Dept. of Agric. Eng., Univ. of NE, pp. S-l-9. Young, R.A., Burwell, R.E. 1972. Prediction of runoff and erosion from natural rainfall using a rainfall simulator. Proc. Soil Sci. Soc. Amer. 36(5):827-830.

1971 Bradford, J.M., Farrell, D.A., Larson, W.E. 1971. Effect of soil overburden pressure on penetration of fine metal probes. Proc. Soil Sci. Soc. Amer. 35(1):12-15. Harmon, W.C., Piest, R.F. 1971. Automatic sediment volume recorder tests on Laboratory Creek, Oxford, MS. Res. Rep. 425. Heinemann, H.G., Rausch, D.L. 1971. Chapter III: Sediment measurement Techniques: Reservoir deposits (Discussion). J. of the Hydr. Div., ASCE, Proc. Paper 8345, (HY9):1555-1561.

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McHenry, J.R., Hawks, P.H., Harmon, W.C., Kelly, W.J., Gill, A.C., Heinemann, H.G. 1971. Determination of sediment density with a gamma probe: a manual of theory, Operation and maintenance for technical operations Model 497. USDA, ARS 41-183, 24 pp. Saxton, K.E., Spomer, R.G., Kramer, L.A. 1971. Hydrology and erosion of loessial watersheds. J. of the Hydr. Div., ASCE, Proc. Paper 8523, 97 (HY11):1835-1851. Spomer, R.G., Heinemann, H.G., Piest, R.F. 1971. Consequences of historic rainfall on western Iowa farmland. Water Resour. Res. 7(3):524-535. Spomer, R.G., Saxton, K.E. 1971. Chapter 5.--Treynor, IA. In: Agricultural Research Service Precipitation Facilities and Related Studies. USDA, ARS. 41-176:37-42.

1970

Heinemann, H.G., Browning, G.M. 1970. Resume of interdisciplinary workshop session "Sediment as a water pollutant." The Role of Agriculture in Clean Water Conf. Iowa State Univ. Press in Agricultural Practices and Water Quality. Ted L. Willrich and George E. Smith, eds. Johnson, H.P., Saxton, K.E., DeBoer, D.W. 1970. The effect of man on water yield, peak runoff and sedimentation. Proc. Iowa Acad. Sci. 76:153-166. Piest, R. F. (Task Committee on Preparation of Sedimentation Manual, Committee on Sedimentation of the Hydraulics Division.) 1970. Chapter IV: Sediment sources and sediment yields. J. of the Hydr. Div., ASCE, Proc. Paper 7337, (HY6):1283-1329. Saxton, K.E. 1970. Data for hydrologic models in the western cornbelt. Proc. ARS and SCS Watershed Modeling Workshop, Tucson, AZ. Saxton, K.E., Whitaker, F.D. 1970. Hydrology of a claypan watershed. Univ. of MO Agric. Expt. Stn. Res. Bul. 974, 47 p.

1969 Burwell, R.E., Larson, W.E. 1969. Infiltration as influenced by tillage-induced random roughness and pore space. Proc. Soil Sci. Soc. Amer. 33(3):449-452. Jamison, V. C. 1969. Wetting resistance under citrus trees in Florida. Water-repellent soils. Proc. of the Symposium on Water-Repellent Soils held at the Univ. of CA, Riverside. pp. 9-15. Kramer, L.A., Meyer, L.D. 1969. Small amounts of surface mulch reduce soil erosion and runoff velocity. Trans. ASAE. 12(5):638-641, 645. Meyer, L.D., Kramer, L.A. 1969. Erosion equations predict land slope development. Agric. Eng. 50(9):522-523. Rausch, D.L., Heinemann, H.G. 1969. Sedimentation and eutrophication research on three small reservoirs. USDA, ARS 41-158, 11 p. Whitaker, F.D., Heinemann, H.G., Larson, W.E. Plant population and row spacing influence maximum corn yield. Univ. of Mo. Agric. Expt. Stn. Res. Bul. 961. 30 pp.

1968 Burwell, R.E., Sloneker, L.L., Nelson, W.W. 1968. Tillage influences water intake. J. Soil and Water Conservation. 23(5):185-187.

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Heinemann, H.G. 1968. Solving sedimentation problems in agricultural watersheds. Soil and America's Future, Proc. 22nd Annual Meeting, Soil Conserv. Soc. Amer. pp. 102-108. Jamison, V.C., Smith, D.D., Thornton, J.F. 1968. Soil and water research on a claypan soil. Tech. Bul. No. 1379, 111 pp. Mannering, J.V., Burwell, R.E. 1968. Tillage methods to reduce runoff and erosion in the corn belt. USDA, ARS, Agr. Info. Bul. No. 330. 14 pp. Meyer, L.D., Kramer, L.D. 1968. Relation between land slope shape and soil erosion. ASAE, December 10-13, 1968, Chicago, IL. Paper No. 68-749. Piest, R.F., Spomer, R.G. 1968. Sheet and gully erosion in the Missouri Valley loessial region. Trans. ASAE. 11(6):850-853. Rausch, D.L., Heinemann, H.G. 1968. Reservoir sedimentation survey methods. Univ. of Mo. Agric. Expt. Stn. Res. Bul. 939, p. 20. Rausch, D.L., Heinemann, H.G. 1968. Sedimentation surveys of small reservoirs. Agric. Eng. 49(7):402-404. Saxton, K.E., Spomer, R.G. 1968. Effects of conservation on the hydrology of loessal watersheds. Trans. ASAE. 11(6):848-849, 853. Timmons, D.R., Burwell, R.E., Holt, R.F. 1968. Loss of crop nutrients through runoff. Minn. Sci. 24(4) 3 pp.

1967 Allmaras, R.R., Burwell, R.E., Holt, R.F. 1967. Plow-layer porosity and surface roughness from tillage as affected by initial porosity and soil moisture at tillage time. Proc. Soil Sci. Soc. Amer. 31(4):550-556. Burwell, R.E., Holt, R.F. 1967. Soil and water losses from Barnes Soil in west-central Minnesota. Minn. Sci., Univ. of Minn. Agric. Expt. Stn., 23(4):10-12. Dvorak, V.I., Heinemann, H.G. 1967. Cooperative runoff and sediment investigations on Medicine Creek Watershed in Nebraska. USDA, ARS 41-130 p. 1-96. Jamison, V.C., Peters, D.B. 1967. Slope length of claypan soil affects runoff. Water Resour. Res. 3(2):471-480. Jamison, V.C., Thompson, G.A. 1967. Layer thickness changes in a clay-rich soil in relation to soil water content changes. Proc. Soil Sci. Soc. Amer. 31(4):441-444. Saxton, K.E., Lenz, A.T. 1967. Antecedent retention indexes predict soil moisture. J. of the Hydr. Div., ASCE, Proc. Paper 5351, Vol. 93(HY4):223-241.

1966 Allmaras, R.R., Burwell, R.E., Larson, W.E., Holt, R.F. Nelson, W.W. 1966. Total porosity and random roughness of the interrow zone as influenced by tillage. USDA-ARS, Conserv. Res. Rep. No. 7. 22 pp. Beer, C.E., Farnham, C.W., Heinemann, H.G. 1966. Evaluating sedimentation prediction techniques in western Iowa. Trans. ASAE 9(6):828-831, 833. Burwell, R.E., Allmaras, R.R., Sloneker, L.L. 1966. Structural alteration of soil surfaces by tillage and rainfall. J. Soil and Water Conserv. 21(2):61-63.

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Farnham, C.W., Beer, C.E., Heinemann, H.G. 1966. Evaluation of factors affecting reservoir sediment deposition. IASH Symp. of Garda, Publ. No. 71, pp. 747-758. Heinemann, H.G., Rausch, D.L., Campbell, R.S. 1966. Sedimentation in a Small Channel-Type Reservoir. IASH Symp. of Garda, Publ. No. 71, pp. 769-779. Minshall, N.E., Whitaker, F.D. 1966. Evaporation pan records needed for small reservoir inflow, calculations. IASH Symp. of Garda, Publ. No.70, pp. 245-257. Whitaker, F.D., Heinemann, H.G. 1966. Fertilizing corn during dry years. Univ. of Mo. Agric. Expt. Stn. Bul. 853. 11 pp. 1-11. Whitaker, F.D., McKibben, J.S., Jones, M.M. 1966. Reduced tillage in corn production. Univ. of Mo. Agric. Expt. Stn. Bul. 852. 12 pp.

1965 Allmaras, R.R., Burwell, R.E., Voorhees, W.B., Larson, W.E. 1965. Aggregate size distribution in the row zone of tillage experiments. Proc. Soil Sci. Soc. Amer. 29(6):645-650. Heinemann, H.G., Dvorak, V.I. 1965. Improved volumetric survey and computation procedures for small reservoirs. Proc. Fed. Inter-Agency Sed. Conf., Jackson, MS, Jan. 1963. USDA Misc. Publ. 970, pp. 845-856. Minshall, N.E., Spomer, R.G. 1965. New type weir construction for small watersheds. J. of the Irrig. and Drain. Div., ASCE, Proc. Paper 4243, 91(IR1):11-15. Minshall, N.E., Jamison, V.C. 1965. Interflow in claypan soil. Water Resources Research. 1(3):381-390. Piest, R.F. 1965. The role of the large storm as sediment contributor. Proc. Fed. Inter-Agency Sed. Conf., Jackson, MS, USDA Misc. Publ. 970, pp. 98-108. Piest, R.F., Heinemann, H.G. 1965. Experimental watersheds contribute useful sedimentation facts. IASH Symp. of Budapest, Publ. No. 66, pp. 372-379. Woolhiser, D.A., Lenz, A.T. 1965. Channel gradients above gully-control structures. J. of the Hydr. Div., ASCE, Proc. Paper 4333, 91(HY3):165-187. Woolhiser, D.A., Saxton, K.E. 1965. Computer program for the reduction and preliminary analyses of runoff data. USDA, ARS 41-109, 33 pp.

1964 Jamison, V.C., Thornton, J.F. 1964. Testing farm pond soils in Missouri for sealing properties. Piest, R.F. 1964. Long-term sediment yields from small watersheds. IUGG General Assembly of Berkeley. Publ. No. 65, pp. 121-140. Thornton, J.F., Beasley, R.P. 1964. Characteristics of flow in Trapezoidal and triangular irrigation furrows. Univ. of MO Agric. Expt. Stn. Res. Bul. 855, 36 pp.

1963 Burwell, R.E., Allmaras, R.R., Amemiya, M. 1963. A description of methods used in the corn belt branch for evaluating tillage practices. Research Report No. 363.

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Burwell, R.E., Allmaras, R.R., Amemiya, M. 1963. A field measurement of Total porosity and surface microrelief of soils. Proc. Soil Sci. Soc. Amer. 27(6):697-700. Jamison, V.C., Thornton, J.F. 1963. Sealing farm ponds in Missouri. Univ. of MO Agric. Expt. Stn. Res. Bul. 817, 28 pp. Jamison, V.C., Thornton, J.F. 1963. Sealing farm ponds in - Ozark Highlands Central Mississippi Valley wooded slopes, and deep loess hills. USDA-ARS 41-78, 20 pp. Woolhiser, D.A., Miller, C.R. 1963. Case histories of gully control structures in Southwestern Wisconsin. USDA-ARS 41-60, 28 pp.

1962 Burwell, R.E. 1962. Runoff and erosion investigations on plastic till soil of Northeastern Illinois. USDA, ARS 41-55. 23 pp. Eagleman, J.R., Jamison, V.C. 1962. Soil layering and compaction effects on unsaturated moisture movement. Proc. Soil Sci. Soc. Amer. 26(6):519-522. Heinemann, H.G. 1962. Using the gamma probe to determine the volume-weight of reservoir sediment. IASH Commission of Land Erosion, Publ. No. 59, pp. 411-423. Heinemann, H.G. 1962. Volume-weight of reservoir sediment. J. of the Hydr. Div.,ASCE, Proc. Paper 3274, Vol. 88:(HY5):181-197. Keppel, R.V., Renard, K.G. 1962. Transmission losses in ephemeral stream beds. J. of the Hydr. Div., ASCE, Proc. Paper 3116, Vol. 8(HY3):59-68. Sharp, A.L., Saxton, K.E. 1962. Transmission losses in natural stream valleys. J. of the Hydr. Div., ASCE, Proc. Paper 3266, Vol. 88(HY5):121-142.

1961 Eagleman, J.R., Jamison, V.C. 1961. The influence of soil textural stratification and compaction on moisture flow. Univ. of Mo. Agric. Expt. Stn. Res. Bul. 784, 14 p. Heinemann, H.G. 1961. Sediment distribution in small floodwater-retarding reservoirs in the Missouri basin loess hills. USDA, ARS 41-44, 37 p. Jamison, V.C., Thornton, J.F. 1961. Water intake rates of a claypan soil from hydrograph analyses. J. of Geophys. Res. 66(6):1855-1860. Larson, W.E., Lovely, W.G., Jamison, V.C. 1961. Subsoiling doesn't pay in the Midwest. Iowa Farm Sci. 15(7):5-6. Minshall, N.E. 1961. Effect of cover and soils on surface runoff. J. Soil and Water Conserv. 16(6):259-264. Thornton, J.F. 1961. Moisture use by cotton in the Piedmont of Georgia. Trans. ASAE. 4(1):37-40, 44. Thornton, J.F. 1961. Use of soil moisture by cotton. J. Soil and Water Conserv. 16(4):169-171. Whitaker, F.D., Jamison, V.C., Thornton, J.F.Runoff and erosion losses from Mexico silt loam in relation to fertilization and other management practices. Proc. Soil Sci. Soc. Amer. 25(5):401-403.

1960

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Heinemann, H.G. 1960. Trap efficiency of reservoirs, debris basins, and debris dams. (Discussion). J. of the Hydraulics Div., Proc. of ASCE, Vol. 86 (HY8):71. Heinemann, H.G. 1960. Using the radioisotope sediment densitometer on Sabetha Lake in Kansas. SWCRD, ARS Res. Rep. No. 343. 18 pp. Jamison, V.C. 1960. Water movement restriction by plant residues in a silt loam soil. Seventh Intern. Cong. Soil Sci., Madison, WI. 1:464-472. Jamison, V.C., Larson, W.E., Lovely, W.G. 1960. Subsoiling seldom pays in the Midwest. J. of Soil and Water Cons. Vol. 15(6):247-251. Jamison, V.C., Thornton, J.F. 1960. Results of deep fertilization and subsoiling on a claypan soil. Agron. J. 52:193-195. Kroth, E.M., Jamison, V.C., Grogger, H.E. 1960. Soil moisture survey of some representative Missouri soil types. ARS 41-34. Larson, W.E., Lovely, W.G., Pesek, J.T., Burwell, R.E. 1960. Effect of subsoiling and deep fertilizer placement on yields of corn in Iowa and Illinois. Agron. J. 52:185-189. Minshall, N.E. 1960. Predicting storm runoff on small experimental watersheds. J. of the Hydr. Div., ASCE, Proc. Paper 2577, Vol. 86(HY8):17-205. Thompson, G.A., Curry, R.B., Thornton, J.F. 1960. Comparison of irrigation systems for alluvial soils. Univ. of Mo. Agric. Expt. Stn. Res. Bul. 758, 8 p.

1959

Jamison, V.C., Thornton, J.F. 1959. Water intake rates of Shelby-Grundy soils from hydrograph analysis. Trans. ASAE 2(1):92-94. Jones, B.A., Burwell, R.E., Atkinson, H.B., Hay, R.C., Van Doren, C.A.1959. Effect of farming across terraces in straight-row field operation. Trans. ASAE 2(1):115-117, 119.

1958 Jamison, V.C. 1958. Sand-silt suction column for determination of moisture retention. Proc. Soil Sci. Soc. Amer. 22(1):82-83. Jamison, V.C., Beale, O.W. 1958. Irrigation of corn in the Eastern United States. USDA, Agr. Handbook No. 140, 14 p. Jamison, V.C., Kroth, E.M. 1958. Available moisture storage capacity in relation to textural composition and organic matter content of several Missouri soils. Proc. Soil Sci. Soc. Amer. 22(3):189-192.

1957 Jamison, V.C. 1957. Make full use of stored soil moisture. J. Soil and Conserv. 12(3):122-125. Thornton, J.F. 1957. Irrigation in the Southeast. The Cotton Gin and Oil Mill Press. p. 2

1956 Jamison, V.C. 1956. How to store more moisture in the soil. What's New in crops and soils. 8(5). 2 pp.

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Jamison, V.C., Domby, C. W. 1956. The effect of a dense soil layer and varying air-water relations on the growth, root development, and nutrient uptake of cotton in commerce silt loam. Proc. Soil Sci. Soc. Amer. pp. 447-453. Jamison, V.C., 1956. Pertinent factors governing the availability of soil moisture to plants. Soil Sci. Soc. Amer. Vol. 81 No. 6. Smith, D.D. 1956. Time study of parallel terraces. Agric. Eng. 37(5):342-345.

1955

Smith, D.D. 1955. Storage Pond Design. Agric. Eng. 36(11):743-746.