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EFFECTS OF RISK, DISEASE, AND NITROGEN SOURCE ON OPTIMAL NITROGEN FERTILIZATION RATES IN WINTER WHEAT PRODUCTION
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Abstract
Interactions among nitrogen (N) fertilization rate, N source, and disease severity can affect mean yield and yield variance in conservation tillage wheat production. A Just-Pope model was used to evaluate the effects of N rate, N source, and disease on the spring N-fertilization decision. Ammonium nitrate (AN) was the utility-maximizing N source regardless of risk preferences. The net-return-maximizing AN rate was 92 lb N/acre, providing 0.52/acrehighernetreturnsthanthebestalternativeNsource(urea).IfafarmercouldanticipateahigherthanaverageTakeâAllinfection,thedifferenceinoptimalnetâreturnsbetweenANandureawouldincreaseto35.11/acre.Crop Production/Industries,