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Phosphorus Solubility in Calcareous Soils: I. Dicalcium Phosphate Activities in Equilibrium Solutions¹

ABSTRACT

A theoretical background for the study of P solubility behavior in calcareous soils has been developed. The mean activity of dicalcium phosphate is used to express P solubility. Calculation of this function corrects for differences in the pH values, Ca concentrations, and ionic strengths which are encountered when a number of soil solutions are compared. The validity of this approach is based on the observation that the ion product aCa⁺⁺ x aHPO₄⁼ in various solutions in equilibrium with a given soil remains constant over a range of values of pH, Ca concentration, and ionic strength.

¹ This work was conducted in cooperation with the Colorado Agr. Exp. Sta. Approved by the Director of the Colorado Agr. Exp. Sta. as Scientific Journal Series No. 527. Presented before Div. II, Soil Science Society of America, Cincinnati, Ohio, Nov. 15, 1956.

² Soil Scientists, Soil and Water Conservation Research Division, ARS, USDA, Colorado State University, Fort Collins.

Received for publication May 23, 1958. Accepted for publication December 2, 1958.