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Abstract

 

This article in SSSAJ

  1. Vol. 23 No. 2, p. 116-118
     
    Received: May 23, 1958


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doi:10.2136/sssaj1959.03615995002300020011x

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

  1. C. V. Cole and
  2. S. R. Olsen2

Abstract

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++ × aHPO4= in various solutions in equilibrium with a given soil remains constant over a range of values of pH, Ca concentration, and ionic strength.

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