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Crop Rotations and Soil Nitrogen¹

ABSTRACT

Evidence from a 39-year record of corn yield from trop rotation experiments on Wooster silt loam soil fails to show long-term cumulative trend effects of commonly-used corn belt rotations on soil productivity. Yield levels characteristic of a given rotation were quickly reached with no pronounced trends thereafter. In general, yield level was associated with soil nitrogen level. Long-term downward trends in apparent soil productivity level were observed under conditions of continuous cropping to corn and under conditions of severe erosion.

¹ Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., Wooster, Ohio. This study was planned and conducted throughout its duration by the co-author. Presented before Div. VI, Soil Science Society of America, St. Paul, Minn., Nov. 9, 1954.

² Professor and Associate Professor (Retired) of Agronomy, respectively.

Received for publication November 18, 1954.