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Prediction of the Concentration of Solutes in Soil Solutions For Soil Systems Containing Gypsum and Exchangeable Ca and Mg¹

ABSTRACT

The equilibrium relationships for the solubility of CaSO₄ in solution and the exchange of Ca⁺⁺ and Mg⁺⁺ between solution and the soil exchange complex may be used in conjunction with the Debye-Hückel theory to predict the equilibrium concentrations of the ions in solution and ions adsorbed by the exchanger when distilled water or a solution of Ca⁺⁺ and/or Mg⁺⁺ salts is used to wet a Ca-Mg-soil which contains an excess of CaSO₄.

The equilibrium concentration of the solution and adsorbed ions have been calculated for mixtures of CaSO₄, Yolo soils, containing different ratios of Ca⁺⁺ to Mg⁺⁺, and distilled water or 0.05 M MgCl₂. The ionic concentration of the equilibrium solution was also determined experimentally for these same mixtures. The theoretical and measured concentrations of the ions in the equilibrium solution are compared.

¹ Contribution from the Department of Irrigation, University of California, Davis.

² Assistant Research Irrigationist.

Received for publication September 12, 1961. Accepted for publication December 5, 1961.