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Synopsis: Yields of wheat were lower in 4 of 7 experiments for fall application of N than for topdressings in the spring. In 3 long-time rotation experiments, 20 to 23% of the deviations of yields from the linear regression of yields on years could be attributed to winter rainfall. These results indicate that the major portion of N for wheat should be topdressed in the spring under Kentucky climatic conditions.
2 Associate Professor of Soil Science, Michigan State University, East Lansing, formerly Associate Professor of Agronomy, University of Kentucky.
Received for publication January 8, 1962.
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