Journal
JOURNAL OF PLANT NUTRITION
Volume 25, Issue 6, Pages 1315-1328Publisher
MARCEL DEKKER INC
DOI: 10.1081/PLN-120004391
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Selection of the nitrogen (N) source and rate for application is critical to ensure profitable wheat (Triticum aestivum L.) yields. The research objective was to evaluate several N sources and spring application rates for conservation tillage wheat production. Research was initiated in the fall of 1997 and continued through 2000 on Collins silt loam (Aquic Udifluvents). A different cultivar was seeded each of the three years. The experimental design was a split-plot with 0, 34, 67, 101, 134, and 168 kg N ha(-1) rates the main plots and N sources (ammonium nitrate, urea, urea-ammonium nitrate, ammonium sulfate and UAN + Ca(NO3)(2) co-mixture) the sub-plots. The yield response to N rate varied with year and N source. For the three years, yields were increased by applying either 67 or 101 kg N ha(-1) Broadcasting AN produced higher yields than urea-containing N sources (urea or UAN) for two of the three years. Broadcasting urea or UAN restricted yields approximately 12% apparently due to N volatilization losses. Broadcasting AS was as effective as AN one of the two years while broadcasting the UAN + Ca(NO3)(2) co-mixture resulted in higher yields at a lower N rate than AN for one of two years. Yield differences due to N source were small when rainfall occurred within two days of soil application. Take-all root rot affected yield one of three years with AN and AS being more efficient N sources. Sulphur fertilization was not needed for wheat production on this soil.
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