Abstract
(...) A field experiment was initiated in 1982 on a Sharpsburg silty clay loam in eastern Nebraska to examine the effects of manure and increasing levels of N, P, K, and micronutrients on grain yield, return over variable costs (ROVC), and variability of ROVC of an irrigated corn (Zea mays L.)-soybean [Glycine max (L.) Merr.]-wheat (Triticum aestivum L.) rotation (CSW) and irrigated continuous corn (CC). Manure was a good fertilizer substitute for producers who have access to it. Corn yields at optimum N-rate were 20% greater for rotation corn (RC) than for CC. (...)
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