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The Correlation of a Phosphorus Soil Test with the Response of Wheat Through a Modified Mitscherlich Equation
Author(s) -
Bray Roger H.
Publication year - 1958
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1958.03615995002200040013x
Subject(s) - phosphorus , phosphate , fertilizer , phosphate fertilizer , nutrient , significant difference , soil nutrients , chemistry , agronomy , soil test , phosphorite , mathematics , soil science , zoology , environmental science , soil water , statistics , biochemistry , organic chemistry , biology
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 c 1 for b 1 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.