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The Effect of Green and Stable Manure on the Yield of Crops and on the Physical Condition of a Tappan-Parkhill Loam Soil¹

ABSTRACT

The effect of sweet clover-green manure and stable manure on the yields of grain and row crops have been studied since 1936. The treatments include the application of these manures every 2, 4, and 6 years. Sweet clover-green manure had a more beneficial effect on the yield of crops than did stable manure. The greatest effects of both manures on crop yields occurred where the manures were applied every 2 years. In the 4- and 6-year treatments, marked beneficial effects were noted immediately following, or 1 year after the application of the manures, with much less or no benefit occurring thereafter until reapplication.

The effects of these treatments on the physical condition of the soil have been studied for 2 years. Granulation of the soil was enhanced by the 2-year treatments. The effects of the treatments on the soil physical condition cannot be completely evaluated until a 6-year study is completed.

¹ Contribution from the Soil Science Department, Michigan Agr. Exp. Sta. Publication authorized by the Director as Journal Article Number 1820. Presented before Div. IV, Soil Science Society of America, Davis, Calif., Aug. 16, 1955.

² Research Instructor, Professor and Head of Soil Science Dept., and Associate Professor, respectively.

Received for publication August 13, 1955.