110

LITERATURE CITED

I¥.L

Alexand.er, P. M. and W. B. Gilbert. 1962. Winter damage tobermuda greens. The Golf Course Reporter 3l(9):50-53.

Barber, S. A. 1959. Relation of fertilizer placement tonutrient, uptake and crop yield: II. Effect of rowpotassium, potassium soil level, and precipitation.Agron. J. 51:97-99.

Baver, L. D. 1927. Factors affecting the hydrogen-ion con-centration of soils. Soil Sci. 23:399-413.

4,.(

Beard, James B. 1973. Turfgrass: Science and Culture.Prentice-Hall, Inc., Englewood Cliffs, New'"Jersey.

J: Beckett, P. H. T. and R. Webster. 1971. Soil variability:A review. Soils Fert. 34:1-15.

Bell, A. P. and s. F. Thornton. 1937. The effect of seasonand fertilization on results of rapid chemical tests.Soil Sci. Soc. Am. Proc. 2:167-171.

Bell, R. S. and J. A. DeFrance. 1944. Influence of fertilizerson the accumulation of roots from closely clipped bentgrasses and on the quality of the turf. Soil Sci. 58:17-24.

,.8. Bouyoucos, G. J. 1962. Hydrometer method improved for makingparticle size analyses of soils. Agron. J. 54:464-465.

0/: Brady, N. C. 1974. The Nature and Properties of Soils. 8thedition. MacMillan Publishing Co., Inc., New York.

Bray, R. H. 1961. You can predict fertilizer needs with soiltests. Better Crops with Plant Food, May-June:18-l9.

Brown, B. A., R. I. Musell, R. F. Holt, and A. V. King. 1956.Soil reactions at various depths as influenced by time sinceapplication and amounts of limestone. Soil Sci. Soc. Am.Proc. 20:518-522.

1-2./

Brown, L. A. 1935. A study of phosphorus penetration and avail-ability in soils. Soil Sci. 39:277-287.

}.3. Bur d, J. S.systems.

1948. Chemistry of the phosphate ion in soilSoil Sci. 65:227-247.

~.f

111

~tr~ Bur d, J. S., and J. C. Martin. 1924. Secular and seasonalchanges in the soil solution. Soil Sci. 18:151-167.

15~ Burgess, P. S. 1924. The effect on present soil reaction of/ long-continued applications of equivalent amounts of high

calcium and high magnesium limes. Soil Sci. 18:169-172.

16. Burns, A. F. and S. A. Barber. 1961. The effect of temperatureand moisture on exchangeable potassium. Soil Sci. Soc. Am.Proc. 25:349-352.

~Y. Butler, J. D. 1965. Thatch-a problem in turf management.Turfgrass Conference Proceedings, University of Illinois.pp. 1-3.

18. Childs, F. D.and E. M. Jen~ks. 1967.of sampling upon soil test results.

Effect of time and depthAgron. J. 59:537-540.

19. Cline, M. G. 1944. Principles of soil sampling. Soil Sci.58:275-288.

20. Corey, R. B. and E. E. Schulte. 1973. Factors affecting theavailability of nutrients to plants. In Soil Testing andPlant Analysis. Edited by L. M. Walsh and J. D. Beaton.Soil Science Society of America, Inc., Madison, Wisconsin.pp. 23-33.

21. Couch, H. B. 1965. Effects of nutrition and pH on turfgrassdisease incidence. 1965 Agronomy Abstracts. p. 44.

22. 1973. Diseases of Turfgrasses. 2nd edition.Robert E. Krieger Publishing Co., Inc., Huntington, NewYork. S t;e,O • ~6~-~·C, f

Dahnke, W. L. and E. H. Vasey. 1973. Testing soils fornitrogen. In Soil Testing and Plant Analysis. Edited byL. M. Walsh-and J. D. Beaton. Soil Science Society ofAmerica, Inc., Madison, Wisconsin. pp. 97-114.

Davis, R. R. 1969. Nutrition and fertilizers. In TurfgrassScience. Edited by A. A. Hanson and F. V. Juska.Agronomy 14:130-150.

25. Escritt, J. R. 1969. Fertilizer trials at Bingley. In Pro';"ceedings of the First International Turfgrass ResearchConference. Sports Turf Research Institute, Bingley,Yorkshire. pp. 185-190.

Evans, E. M., R. D. Rouse, and R. T. Godauskas. 1964. Low soilpotassium sets up coastal for a leaf spot disease. High1ts.Agric. Res. 11:2. Agric. Exp. Stn. of Auburn University,Auburn, Alabama.

112

';?f. Fine, L. 0., T. A. Baily, and E. Troug. 1940. Availability offixed potassium as influenced by freezing and thawing.Soil Sci. Soc. Am. Proc. 5:183-186.

,28. Fitts, J.W. and J. J. Hanway. 1971. Prescribing soil and cropnutrient needs. In Fertilizer Technology and Use. 2ndedition. Edited by R. A. Olson, T. J. Army, J. J. Hanway,and V. J. Kilmer. Soil Science Society of America, Inc.,Madison, Wisconsin. pp. 57-79.

f~. , and W. L. Nelson. 1956. The determination of limeand fertilizer requirements of soils through chemical tests.Adv. Agron. 8:241-282.

~o. Fox, R. L. and E. J. Kamprath. 1971. Adsorption and leaching ofP in acid organic soils and high organic matter sand. SoilSci. Soc. Am. Proc. 35:154-156.

~~ Gilbert, W. B. and D. L. Davis. 1971. Influence of fertilityratios on winter-hardiness of bermudagrass. Agron. J.63:591-593.

?2~ Goss, R. L. 1963. Response of bentgrass putting green turf tovarious ratios of N, P, and K. 1963 Agronomy Abstracts.p. 118. si, ,,~\

31~: 1969. Some inter-relationships between nutrition( and turf diseases. In Proceedings of the First International

Turfgrass Research Conference. Sports Turf ResearchInstitute, Bingley, Yo'rkshLre , pp. 351-361.

34( Harper, J. C. 1952. Relationship of aerification, irrigation,/' and cempaction to phosphorus penetration, root development,

and population changes in a mixed turf of permanent grasses.Ph.D. Thesis. Pennsylvania State University.

35. ,and W. W. Hinish. 1970. Interpreting soil tests forturfgrass maintenance. Leaflet ST 5, The Pa. State Univ.,ColI. of Agr. Extension Service.

36. Hausenbuiller, R. L. 1972. Soil Science: Principles and/ Practices. WID. C. Brown Company Publishers, Dubuque, Iowa.

pi. Haynes, R. F. and R. E. Schmidt. 1973. Effect of compactionand differential irrigation on nutrient movement and physicalchanges of differently modified putting green soils. 1973Agronomy Abstracts. p. 59.

Hinish, W. W. 1973. Soil Testing Handbook. Pennsylvania StateUniversity Extension Service.

113

Holt, E. C. and R. L. Davis.· 1948. Differential responses ofArlington and Norbeck bent grasses to kinds and rates offertilizers. Journal;.of the·American Society of Agronomy.40:282-284.

Horn, G. C. 1969. Potassium fertilizers for Tifway bermuda-grass.· In Proceedings of the First International TurfgrassResearchConference.· Sports Turf Research Institute,·Bingley, Yorkshire. pp. 204~2ll.

Hull, R. J. and L. M. Smith. 1974. Photosynthate translocationand metabolism in Kentucky bluegrass turf as a function offertility. In Proceedings of the Second International Turf-grass Research Conference. Edited by E. C. Roberts. AmericanSociety of Agronomy and Crop Science Society of America,Madison, Wisconsin. pp. 186-195.

_________ , N. Jackson, and C.R. Skogley. 1975. Stripe smutseverity as influenced by turfgrass nutrition. 1975Agronomy Abstracts. p. 99.

Hylton, L. 0., A. Ulrich, D. R. Cornelius, and K. Okhi. 1965.Phosphorus nutrition of Italian ryegrass relative to growth,moisture content, and mineral constitutents. Agron. J.57:505-508.

44. Jones, J. B., Jr. 1973. Soil testing in the United States.Corom. Soil Sci. Plant~al. 4t4):307-322.

S C::;:-''1 o . - ~ " (d, <-.1Juska, F. V. 1959. Response of Meyer zoysia to lime and

fertilizer treatments. Agron. J. 51:81-83.

ft6. __________ , A. A. Hanson, and C. J. Erickson. 1965. Effectsof phosphorus and other treatments on the development of redfescue, Merion, and common Kentucky bluegrass. Agron. J.57:75-78.

_______ , and J. J. Murray. 1974. Performance of bermuda-grass in the transition zone as affected by potassium andnitrogen. In Proceedings of the Second International Turf-grass Research Conference. Edited by E. C. Roberts.American Society of Agronomy and Crop Science Society ofAmerica, Madison, Wisconsin. pp. 149-154.

Kamon, L. 1974. Magnesium deficiency in zoysiagrass. InProceedings of the Second International Turfgrass ResearchConference. Edited by E. C. Roberts. American Society ofAgronomy and Crop Science Society of America, Madison,Wisconsin. pp. 145-148.

114

49. Keen, R. A. 1969. Turfgrasses under semi-arid and arid con-ditions. In Turfgrass'Science.' Edited by A. A. Hanson andF. V. Juska. Agronomy l4:529~54l.

56. Keeny, D. R. and R. B. Corey. 1963-. Factors affecting the limerequirements of Wisconsin soils~ Soil Sci. Soc. Am. Proc.27:277-280.

~L Kononova, M. M. 1966. Soil Organic Matter: Its Nature, ItsRole in Soil Formation and in Soil Fertility. 2nd Edition.Pergamon Press, Oxford.

/}2. Ledeboer, F. B. and C. R. Skogley. 1967. Investigations intothe nature of thatch and methods for its decomposition.Agron. J. 59:320-322.

5r. Markland, F. E., E. C. Roberts, and L. R. Frederick. 1969.Influence of nitrogen fertilizers on Washington creepingbencgrass., Agrostis_ palustris Huds , II. Incidence of dollarspot, Sclerotinia homeocarpa, infection. Agron. J. 61:701-705.

f J1{. McVey, G. R. 1968. How seedlings respond to phosphorus. Weeds,Trees, and Turf 7(6):18-19.

____55. Mehlich, A. 1972. Uniformity of expressing soil test results:A case for calculating results on a volume basis. Corom.Soil Sci. Plant Anal. 3(5):417-424.

56. 1973. Uniformity of soil test results as influencedby volume weight. Communications in Soil Science and PlantAnalysis 4(6):475-486.

Meinhold, V. H., R. L. DubIe, R. W. Weaver, and E. C. Holt. 1973.Thatch accumulation in bermudagrass turf in relation tomanagement. Agron. J. 65:833-835.

Melsted, S. W. 1967. The philosophy of soil testing. In SoilTesting and Plant Analysis, Part 1. Soil Science Societyof America, Inc., Madison, Wisconsin. pp. 13-22.

, and T. R. Peck. 1973. The principles of soil-----testing. In Soil Testing and Plant Analysis. Edited byL. M. Walsh and J. D. Beaton. Soil Science Society ofAmerica, Inc., Madison, Wisconsin. pp. 13-21.

6.6./

Menn, W. G. and G. G. McBee. 1967. A study of certain nutri-tional requirements for Tifgreen bermudagrass utilizinga hydroponic design. 1967 Agronomy Abstracts, p. 54.

~l. and 1970. A study of certain nutritional-----requirements for Tifgreen bermudagrass (Cynodo~dactylon x Q.transvaalensis ~.) utilizing a hydroponic system. Agron. J.62:192-194.

115

Meyer, B. S., D. B. Anderson, R. H. Bahning, and D. G. Fratianne.1973. Introduction t.o iP'Lant; Physiology.· 2nd edition. D.VaIlNostrand Company", New York •.

Midgley, A. R. 1931'. 'Themovement and fixation of phosphatesin relation to permanent pasture fertilization. J. Am. Soc.Agron. 23:788-798.

64~ Millar, C. E. and L. M. Turk.' 1951'. Fundamentals of Soil Science~'2nd edition. John Wiley and Sons, Inc., New York.

Monroe, C. A., G. D. Coorts, and C. R. Skogley. 1969. Effectsof nitrogen-potassium levels on the growth and chemicalcomposition of Kentucky bluegrass. Agron. J. 294-296.

Musser, H. B. 1948. Effects of soil acidity and availablephosphorus on population changes in mixed Kentucky bluegrass-bent turf. J. Am. Soc. Agron. 40:614-620.

67. 1962. Turf Management. McGraw-Hill Book Company,New York.

Palmertree, H. D., C. Y. Ward, and R. H. Pluenneke. 1974.Influence of mineral nutrition on the cold tolerance andsoluble protein fraction of centipe~egrass. In Proceedingsof the Second International Turfgrass Research Conference.Edited byE. C. Roberts. American Society of Agronomy andCrop Science Society of America, Madison, Wisconsin. pp.500-507.

69. Pellett, H. M. and E. C. Roberts. 1963. Effects of mineralnutrition on high temperature induced growth retardation ofKentucky bluegrass. Agron. J. 55:473:476.

70/~ Piper, C. S. 1942. Soil and Plant Analysis. The Hassel Press,Adelaide, Australia.

~. Pritchett, W. L. and G. C. Horn. 1966. Fertilization fightsturf disorders. Better Crops with ·Plant Food 50:3-22.

Reed, J. F. 1953. Sampling soils for chemical tests.Crops with Plant Food 37(8):13-18.

Better

7';3.Reynolds, E. B. and J. C. Smith. 1946. The effects of fertilizertreatments and dates of sampling on the easily soluble phos-phorus in soil. Soil Sci. Sco. Am. Proc. 11:198-200.

71/. Schaller, F. W. 1940. The downward movement of lime and super-// phosphate in relation to permanent pasture fertilization.

Soil Sci. Soc. Am. Proc. 5:162-166.

/

&3.I'

.~86.

116

75< Shellt o. E. and L. E. Olson. '1946.' The effect of surface-applied phosphate' and· limestone, on. soil nutrients and pH,of perinanent pastures~;Soi1 Sci. Soc. Am. Proc. 11:238-245.

7(1. Smith, C. M. 1972. Diagnostic methods.' In The' FertilizerHandbook. EditedbyW. C. White and D. N. Collins. TheFertilizer Institutet'Washington, D. C. pp. 115-141.

7'1. Smith, G. E.duction.

1954. Soil fertility, basis for high crop pro-Better Crops with Plant Food 38(3):22-26.

7R. Thomas, G. W. 1968. The future of fertilizer: Soil testing.Crops Soils 21(2):4.

_____ , and J. Hanway. 1968. Determining fertilizer needs.In Changing Patterns in Fertilizer Use. Edited by R. C.Dinauer. Soil Science Society of Americat Inc., Madison,Wisconsin. pp. 119-140.

Thompson, W. R., Jr. 1967. Control of thatch in Tifgreenbermudagrass.1967 Proc. Fla. Turfgrass Mgt. Conf. 15:53-55.

8~.,/

Tisdale, S. L. 1967. Problems and opportunities in soil testing.In Soil Testing and Plant Analysis, Part 1. Soil ScienceSociety of America, Inc., Madison, Wisconsin. pp. 1-11.

________ , and W. L. Nelson. 1966. Soil Fertility andFertilizers. The MaCMillan Company, New York.

Tripplett, G. B.t Jr. and D. M. Van Doren, Jr. 1969. Nitrogen,phosphorus, and potassium fertilization of non-tilled maize.Agron. J. 61:637-639.

van der Paauw, F. 1958. Relations between the potash require-ments of crops and meteorological conditions. Plant Soil9:254-268.

&5. Waddington, D. V., E. L. Mobergt and J. M. Duich. 1972.Effects of N source, K source, and K rate on soil nutrientlevels and the growth and elemental composition of Penncrosscreeping bentgrass, Agrostis palustris Huds. Agron. J. 64:562-566 •

t T. L. Zimmerman, G. J. Shoop, L. T. Kardost and------J. M. Duich. 1974. Soil modification for turfgrass areas.I. Physical properties of physically amended soils.Progress Report 337, Pennsylvania State University Agri-cultural Experiment Station.

Walker, R. H. and C. Ward. 1974. Influence of Nand K nutritionon net photosynthesis, dark respirationt and carbohydrates

.---91.

117

i.n.eent Ipedegrasa, In .P.~oceedi,ags,ofthe Second InternationalTurfgJ;a~s,Research Confe rence ~'.Edited by E" C" "Roberts, 'Ameri,can Societyof.Agronomy'and,Crop Science Society ofAmerica~ Madison, Wisconsin.' pp. 196~208.

Welch, C. D. and J. W~.Fitts~' '1956,., ,Some factors affectingaod.L sampling. Soil Sci. Soc. Am. Proc. 20:54-56: '

, and R. D. Weise. :,,1973.•' Opportunities to improve-----soil testing programs. 'In Soil Testing and Plant Analysis.Edited by L. M. Walsh and:J~ D. Beaton. Soil ScienceSociety of America, Madison, Wisconsin. pp. 1-11.

Westfall, R. T. and J. A. Simmons. 1971. Gerinination andseedling development of Windsor Kentucky bluegrass asinfluenced by phosphorus and other nutrients. 1971Agronomy Abstracts. p. 52 •

Wilson, C. G. 1973. Soil tests in lawn fertilization. In TheHome Lawn Handbook. Brooklyn Botanic Garden, Brooklyn,New York. p. 12.

Zimmerman, T. L. 1969. Infiltration rates and fertility levelsof physically amended Hagerstown soil. M. S. Thesis.Pennsylvania State University.

APPENDIX

119

Table 33. Significance of F-ratios for analyses of variance of soilfertility values of the 1966 Nitrogen Source Test.

Source ofvariation

Significance of F-Ratios

d.f. pH pHB P K Mg Ca CEC K Mg Ca

Replications 2 NS NS NS ** NS NS NS NS NS NS

Treatment 9 NS NS * .**. ** NS NS .** ** NS

error a 18

Depth 2 ** ** ** ** ** NS ** ** ** ** .Treatment x Depth 18 NS NS * NS NS NS NS NS NS NS

error b 40

Total 89

* Significant at 5% level.

** Significant at 1% level.

NS Nonsignificant.

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E-I 1=4~ PolP-t~ ~1=4~ Pol 1=4 ~ E-I ole Z

123

124

Table 37. Significance of F-ratios for analysis of variance ofexchangeable potassium for type of sample in thePenncrossFerti1ity Test.

Source of variation d.f. Significance ofF-ratios

Blocks 2 NS

Potassium Rate 2 **Error a 4

Type of sample 2 **Potassium rate x Type 4 **

of sample

Error b 12

Total 26

** Significant at 1% level.

NS Nonsignificant.

125

Table 38. Significance of F-ratios for analysis of variance ofexchangeable potassium for type of sample in the 1971Nitrogen Source Test.

Source of variation d.f. Significance ofF-ratios

Blocks 3 NS

Fertilizer Ratio 2 **Error a 6

Type of Sample 2 **Fertilizer ratio x Type 4 NS

of sample

Error b 18

Total 35

** Signifcant at 1% level.

NS Nonsignificant.

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fa faor-! or-!(/) (/)

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126