Building a Maximum Yield Cropping System for Corn, Wheat and Double-cropped Soybeans
IPNI-1990-USA-MD6
01 Mar 1997
1996 Annual Interpretive Summary
Building a maximum yield cropping system for corn, wheat and double cropped soybeans, 1996
A new four crop/three year cropping system was introduced into the study. It consists of no till soybeans in corn stubble, followed by minimum till (100 bu/A) wheat, no till soybeans, and then no till corn the third year. In the first year, this new rotation resulted in higher corn (14 bu) and soybean (5 bu) yields than other established rotation systems. Full season soybeans in the above new rotation yielded 37 bu/A while conventional tilled beans yielded 25 bu/A and soybeans rotated with no till corn yielded 32 bu/A. Corn in the above new rotation yielded 174 bu/A while conventional corn/soybean rotation corn yielded 144 bu/A in 1995. The no till corn/soybean rotation corn yielded 153 bu/A. Madison wheat yielded 107 to 110 bu/A under intensive nutrient management, Baytan seed treatment and conventional tillage. Notill wheat with Baytan seed treatment planted after notill soybeans or corn yielded from 102 to 107 bu/A. Wheat yields were consistently lower regardless of tillage without the Baytan seed treatment. Narrow row corn studies with two hybrids (P-3394 and SS 682 each at 28,900 final stand) showed a 7.2% yield increase with 15-inch rows (193 bu/A) as compared to 30-inch rows (180 bu/A). MD-06F