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Investigations of Tillage for Soil and Water Conservation I. A Comparison of Crop Yields for Contour vs. Up and Downslope Tillage¹

ABSTRACT

An experiment consisting of 6 sets of paired plots on a 10% slope of Honeoye silt loam in Central New York was started in 1942. Management factors such as fertilization, rotation, tillage, and crop have been the same for each pair. One plot of each pair, however, has been plowed and planted on the contour and the other up and downhill. Not only have crop yields differed significantly over the period 1942 through 1954 but the yield advantage in favor of contouring has been increasing. By 1954 the difference calculated from average regression amounted to 21.3%. Reasons for these cumulative benefits of contouring are discussed. The results of soil studies will be given in later papers of the series.

¹ Contribution from Soil and Water Conservation Research Branch, A.R.S., U.S.D.A., in cooperation with the Cornell University Agr. Exp. Sta. The contributions of others in this study, particularly those of John Roehl, Paul J. Zwerman, and James L. McGuinness are gratefully acknowledged.

² Soil Conservationist and Project Supervisor, Ithaca, N. Y.

Received for publication December 28, 1955.