Abstract
Crop management systems need to be designed to maintain economic profitability and minimize negative environmental impact. The objective of this study was to determine the effects of previous crop, yield potential, and residual soil nitrate (RSN) on grain yield response to N fertilizer of sorghum [Sorghum bicolor (L.) Moench.] and corn (Zea mays L.). Trials were conducted on 38 farms in 14 counties in eastern Nebraska during 1988 to 1990 and separated by previous crop into three groups, including (i) cereal [either sorghum, corn, oat (Avena sativa L.), wheat (Triticum aestivum L.), or rye (Secale cereale L.)1, (ii) soybean [Glycine max (L.) Merr.], and (iii) forage legume [either alfalfa (Medicago sativa L.), sweet clover (Melitotus officinalis Lam.), or red clover (Trifolium pratense L.)] [...]
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