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Effect of Extractant and Selected Soil Properties on Predicting the Correct Phosphorus Fertilization of Soybean
Author(s) -
Lins I. D. G.,
Cox F. R.
Publication year - 1989
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/sssaj1989.03615995005300030031x
Subject(s) - phosphorus , chemistry , extraction (chemistry) , human fertilization , fertilizer , soil water , adsorption , soil test , clay soil , cation exchange capacity , greenhouse , agronomy , soil science , environmental science , chromatography , organic chemistry , biology
The rate of phosphorus required to maximize soybean [ Glycine max (L.) Merr.] yields is dependent on the concentration of extractable P along with other chemical and mineralogical characteristics of the soil. Clay content, surface area, P adsorption maximum, type of clay, and extractable phosphorus were evaluated in order to enhance the prediction of the rate of P required for optimum soybean growth on seven acid soils in the greenhouse. The soil test extractants were: Mehlich‐1, Mehlich‐3, Bray‐1, and an ion exchange resin method. The critical P level by each extraction method was correlated with clay content and, in one case, also with type of clay. Clay content and surface area were the most effective additional criteria found to improve the prediction of P fertilizer rate. The Mehlich‐3 extractant was superior to Bray‐1 and the resin method; Mehlich‐1 was least predictive. From a practical standpoint, clay content and extractable P offer the best means of predicting the rate of P required.