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The Relation Between Precipitation, Temperature and the Yield of Corn on the Agronomy South Farm, Urbana, Illinois¹

Synopsis: Precipitation and maximum daily temperatures 50 to 74 days before and 14 to 30 days after full tassel explained up to 67% of the corn yield variability during the period 1903 through 1956. When the upward trend in yields was included in this analysis, approximately 75% of the corn yield variability was explained.

² Formerly Graduate Assistant, University of Illinois, now Graduate Assistant, Department of Soil Science, Michigan State University; and Professor of Soil Physics, University of Illinois, respectively. The authors are indebted to A. L. Lang and associates for the corn yield data, and to W. C. Jacob for many valuable suggestions concerning statistical methodology throughout this investigation. Acknowledgments are also due E. R. Leng and C. Y. Arnold who supplied data and ideas for calculating the anthesis date from the corn planting date.

Received for publication October 30, 1957.