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This article in SSSAJ

  1. Vol. 22 No. 4, p. 314-317
    Received: July 3, 1957
    Accepted: Mar 10, 1958

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The Correlation of a Phosphorus Soil Test with the Response of Wheat Through a Modified Mitscherlich Equation1

  1. Roger H. Bray2



Variations in soil, season, and variety were found not to change the relative response of wheat to a soluble phosphate. But the difference in distribution pattern between the applied and native sorbed phosphorus varied their efficiencies such that the response to the applied phosphorus followed a c log x form of the Mitscherlich equation. Values of c for log x and c1 for b1 were established. When easily acid-soluble forms are absent these constants can, through soil tests, be used to calculate approximate fertilizer needs and percentage responses obtainable with wheat for a broadcast and double-disced application of soluble phosphate. The results obtained are in agreement with the writer's nutrient mobility concept.

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