A comparison of nitrogen fertilizer additives. R. Jay Goos Professor Department of Soil Science North Dakota State University

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1 A comparison of nitrogen fertilizer additives R. Jay Goos Professor Department of Soil Science North Dakota State University

2 Today, I ll summarize My studies on ammonia loss inhibitors My studies on nitrification inhibitors

3 First studies started in 1983 Evaluated ATS as a urease and nitrification inhibitor for use with UAN liquid

4 5% ATS, Goos and Fairlie, 1988

5 5% ATS, Goos and Fairlie, 1988

6 5% ATS, Goos and Fairlie, 1988

7 5% ATS, Goos and Fairlie, 1988

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14 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

15 2008 study. Does Nutrisphere-N slow ammonia loss?

16 Ammonia trapped in porous sponge containing phosphoric acid

17 Franzen, et al. 2011

18 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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21 Goos (paper in review)

22 2011 study, many additives tested for granular urea

23 Goos, 2011

24 Nitrification inhibitors Large urea granules + DCD Banded UAN studies Fall N studies Current studies

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26 Spring banded UAN

27 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

28 Ammon. in bands Wheat Total N Late Oct. Mid-May Yield Uptake ppm N bu/a lb/a Control Aqua Aqua + ATS Aqua + N-Serve Goos and Johnson, 1999

29 2011 nitrification studies Urea granules incubated with soil Studies still being conducted

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32 Goos, 2011

33 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

34 Papers cited, and related papers, listed below. All papers available in PDF format upon request:

35 Goos, R.J. 201x. Effect of fertilizer additives on ammonia loss after surface application of ureaammonium nitrate fertilizer. Communications in Soil Science and Plant Analysis (in review). Goos, R.J 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 Field and laboratory studies comparing Nutrisphere-Nitrogen urea with urea in North Dakota, Arkansas, and Mississippi. Journal of Plant Nutrition. 34:

36 Goos, R. J. and B. E. Johnson Performance of two nitrification inhibitors over a winter with exceptionally heavy snowfall. Agronomy Journal 91: Goos, R. J., J. A. Schimelfenig, B. R. Bock, and B. E. Johnson Response of spring wheat to nitrogen fertilizers of differing nitrification rate. Agronomy Journal 91: Goos, R. J. and Antonio de Padua Cruz Effect of ammonium sulfate pretreatment on ammonia volatilization after urea fertilization. Communications in Soil Science and Plant Analysis 30:

37 Goos, R. J. and B. E. Johnson Effect of urea pellet size and dicyandiamide on residual ammonium in field microplots. Communications in Soil Science and Plant Analysis 24: Goos, R. J. and B.E. Johnson Effect of ammonium thiosulfate and dicyandiamide on residual ammonium in fertilizer bands. Communications in Soil Science and Plant Analysis 23: Goos, R. J. and T. E. Fairlie Effect of ammonium thiosulfate and liquid fertilizer droplet size on urea hydrolysis. Soil Science Society of America Journal 52:

38 Fairlie, T. E. and R. J. Goos Urea hydrolysis and ammonia volatilization characteristics of liquid fertilizer mixtures. II. Studies under modified field conditions. Journal of Fertilizer Issues 3: Goos, R. J Urea hydrolysis and ammonia volatilization characteristics of liquid fertilizer mixtures. I. Laboratory studies. Journal of Fertilizer Issues 2: Goos, R. J Identification of ammonium thiosulfate as a nitrification and urease inhibitor. Soil Science Society of America Journal 49: