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Influence of Neutral Salts on the Phosphate Ion Concentration in Soil Solution¹

ABSTRACT

Certain cation activity ratios and ion activity products involving Ca⁺⁺, H⁺, K⁺ and H₂PO₄^- were found to remain constant in soil and clay suspensions as the electrolyte concentration was increased. The observed constancy of the cation activity ratios could be attributed to the fact that the concentrations of the cations on the surface of the soil particles remained constant under the conditions of the experiments. The constancy of the ion activity products involving Ca⁺⁺, H⁺, K⁺, and the H₂PO₄^- ion could be explained either by assuming that the phosphate ion is coadsorbed with exchangeable cations on the soil particles or by postulating the existence in the soil of any crystalline phosphate compound having a definite solubility product.

¹ Agronomy paper No. 493, Department of Agronomy, Cornell University, Ithaca, N. Y. Presented before Div. II, Soil Science Society of America, Cincinnati, Ohio, Nov. 17, 1959.

² Assistant Professor of Soil Science and Professor of Soil Science, respectively. The senior author is now Assistant Professor of Soil Science, University of British Columbia, Vancouver, Canada.

Received for publication December 28, 1959. Accepted for publication February 16, 1960.