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This article in AJ

  1. Vol. 52 No. 5, p. 245-247

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

  1. E. C. A. Runge and
  2. R. T. Odell22



Precipitation and maximum daily temperatures from June 25 through September 20 explained 68% of the variation in soybean yields from 1909 through 1957. Above-normal precipitation during July (period of major vegetative growth) and from mid-August to mid-September (grain filling period) increased soybean yields, but abundant rainfall during other periods decreased yields. Maximum temperatures during July and August are too high for optimum soybean yields.

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