Abstract
(...) Our objectives were to use a systems model to evaluate the factors influencing corn fertilizer N requirements in soil-climate conditions typically encountered in the northern U.S. Corn Belt. Aboveground crop N requirements at near maximum yields ranged from 190 to 240 lb N/acre on an irrigated loamy sand soil and two rainfed silt loam soils. At equivalent yield levels, crop N requirements were an average of 25 lb N/acre lower on the irrigated loamy sand soil than on the two silt loam soils. Amounts of N in corn stover at maximum yields averaged 86 lb N/acre. (...)
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