Corn Growth and Yield under Different Crop Rotation, Tillage, and Management Systems

Rotation effects on corn (Zea maysL.) growth have not been documented. Our objective was to evaluate dry matter (DM) and N accumulation of corn following corn, soybean [Glycine max(L.)Merr.], or wheat/red clover (Triticum aestivumL./Trifolium pratenseL.) using moldboard plow, chisel, and ridge tillage under high (broadcast herbicides and 163 kg N ha−1) and low chemical management (banded herbicides and 95 kg N ha−1). In 1993, corn following soybean, compared with corn under high chemical management, had greater DM and N accumulation during vegetative development but similar N accumulation after silking (45 kg ha−1) and yield (7.6 and 7.2 Mg ha−1, respectively). In 1994, corn following soybean, compared with corn under high chemical management, had similar DM and N accumulation during vegetative development, but greater N accumulation (59 and 35 kg ha−1, respectively) after silking and yield (11.4 and 10.7 Mg ha−1). Corn following wheat/clover under both management systems, compared with corn following corn under high chemical management, had greater DM and N accumulation during vegetative development in 1994. Corn following wheat/clover under high chemical management had the greatest N accumulation after silking (79 kg ha−1) and yield (12.0 Mg ha−1), whereas the other two systems had the same N accumulation after silking and yield. Corn yield had linear responses to N accumulation after silking in 1993 (r2= 0.47) and 1994 (r2= 0.87). We conclude that N accumulation after silking influenced the yield response to rotation more than DM and N accumulation during vegetative development did.