r. jay goos professor department of soil science north ... · ammonium in fertilizer bands....
TRANSCRIPT
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A comparison of nitrogen fertilizer additives
R. Jay Goos
Professor
Department of Soil Science
North Dakota State University
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• Today, I’ll summarize
– My studies on ammonia loss inhibitors
– My studies on nitrification inhibitors
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• First studies started in 1983
– Evaluated ATS as a urease and nitrification inhibitor for use with UAN liquid
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• 5% ATS, Goos and Fairlie, 1988
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• 5% ATS, Goos and Fairlie, 1988
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• 5% ATS, Goos and Fairlie, 1988
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• 5% ATS, Goos and Fairlie, 1988
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ATS as a urease inhibitor
• Not a general-purpose urease inhibitor
– Works better with drier soils
– Works better with larger droplet sizes
– Works better on soil than on stubble
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2008 study. Does Nutrisphere-N slow ammonia loss?
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• Ammonia trapped in porous sponge containing phosphoric acid
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• Franzen, et al. 2011
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2010 study, ammonia loss inhibitors used with UAN
• UAN applied at about 100 kg N/ha, with and without various additives
• Experiment performed four times
– Small droplets, bare soil
– Large droplets, bare soil
– Small droplets, 50% stubble cover
– Large droplets, 50% stubble cover
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• Goos (paper in review)
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• 2011 study, many additives tested for granular urea
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• Goos, 2011
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Nitrification inhibitors
• Large urea granules + DCD
• Banded UAN studies
• Fall N studies
• Current studies
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Spring banded UAN
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Fall N with ATS or N-Serve
• Aqua ammonia banded in early October 1996 Record over-winter snowfall
• Soil samples taken late in fall, early spring
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Ammon. in bands Wheat Total N
Late Oct. Mid-May Yield Uptake
ppm N bu/A lb/A
Control 2 3 23.6 34.6
Aqua 43 1 37.1 52.9
Aqua + ATS 65 11 47.4 77.0
Aqua + N-Serve 72 14 45.1 72.2
• Goos and Johnson, 1999
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2011 nitrification studies
• Urea granules incubated with soil
• Studies still being conducted
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• Goos, 2011
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To summarize many, many experiments….
• Reactions of nitrogen in the soil are very difficult to inhibit
• If you need an inhibitor, use the strongest one available
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• Papers cited, and related papers, listed below.
• All papers available in PDF format upon request: [email protected]
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• Goos, R.J. 201x. Effect of fertilizer additives on
ammonia loss after surface application of urea-
ammonium nitrate fertilizer. Communications in Soil
Science and Plant Analysis (in review).
• Goos, R.J. 2011. Nitrogen fertilizer additives, which
ones work? Proceedings of the North Central
Extension-Industry Soil Fertility Workshop.
• Franzen, D., R.J. Goos, R.J. Norman, T.W. Walker,
T.L. Roberts, N.A. Slayton, G. Endres, R. Ashley, J.
Staricka, and J. Lukach. 2011. Field and laboratory
studies comparing Nutrisphere-Nitrogen urea with
urea in North Dakota, Arkansas, and Mississippi.
Journal of Plant Nutrition. 34:1198-1222.
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• Goos, R. J. and B. E. Johnson. 1999. Performance of
two nitrification inhibitors over a winter with
exceptionally heavy snowfall. Agronomy Journal
91:1046-1049.
• Goos, R. J., J. A. Schimelfenig, B. R. Bock, and B. E.
Johnson. 1999. Response of spring wheat to
nitrogen fertilizers of differing nitrification rate.
Agronomy Journal 91:287-293.
• Goos, R. J. and Antonio de Padua Cruz. 1999. Effect
of ammonium sulfate pretreatment on ammonia
volatilization after urea fertilization. Communications
in Soil Science and Plant Analysis 30:1325-1336.
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• Goos, R. J. and B. E. Johnson. 1993. Effect of urea
pellet size and dicyandiamide on residual ammonium
in field microplots. Communications in Soil Science
and Plant Analysis 24:397-409.
• Goos, R. J. and B .E. Johnson. 1992. Effect of
ammonium thiosulfate and dicyandiamide on residual
ammonium in fertilizer bands. Communications in
Soil Science and Plant Analysis 23:1105-1117.
• Goos, R. J. and T. E. Fairlie. 1988. Effect of
ammonium thiosulfate and liquid fertilizer droplet
size on urea hydrolysis. Soil Science Society of
America Journal 52:522-524.
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• Fairlie, T. E. and R. J. Goos. 1986. Urea hydrolysis
and ammonia volatilization characteristics of liquid
fertilizer mixtures. II. Studies under modified field
conditions. Journal of Fertilizer Issues 3:86-90.
• Goos, R. J. 1985. Urea hydrolysis and ammonia
volatilization characteristics of liquid fertilizer
mixtures. I. Laboratory studies. Journal of Fertilizer
Issues 2:38-41.
• Goos, R. J. 1985. Identification of ammonium
thiosulfate as a nitrification and urease inhibitor. Soil
Science Society of America Journal 49:232-235.