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Soil Science Society of America Journal Abstract -

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


This article in SSSAJ

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

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  1. C. V. Cole and
  2. S. R. Olsen2



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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