Abstract
Economic and environmental incentives to accurately predict corn (Zea mays L.) N requirements emphasize the need to accurately credit N supplied to first-year corn from a previous alfalfa (Medicago sativa L.) crop. A 4-yr study (24 site-yr) was conducted to evaluate the use of preplant and pre-sidedress soil and basal stalk nitrate tests and an end-of-season stalk nitrate test to assess N availability to first-year corn following alfalfa. Pre-sidedress soil and basal stalk samples were obtained when corn was 6 to 12 in. tall and analyzed for nitrate. Grain yield was not significantly increased by applied N at any location during the study [...]
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