CONSERVATION and conventional tillage systems were evaluated for continuous production of corn (Zea mays L.) and for production of corn and soybeans [Glycine max (L.) Merr.] in rotation. The fall moldboard plow system had the highest 5-yr average yield for con-tinuous corn production. Tillage systems did not signifi-cantly affect yields of either corn or soybeans in the corn-soybean rotation study. The percentage of the soil sur-face covered with plant residue following soybeans, in the corn-soybean rotation, was nearly as great as following corn. However, the soybean residue cover was much more easily destroyed by tillage than was the corn residue.
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Donald C. Erbach (1982) studied this question.