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

ABSTRACT

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.

¹ Contribution from the Department of Agronomy, Illinois Agr. Exp. Sta., Univ. of Illinois, Urbana. Published with the approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. IV, Soil Science Society of America, Nov. 15, 1956, at Cincinnati, Ohio.

² Professor of Soil Fertility.

Received for publication July 3, 1957. Accepted for publication March 10, 1958.