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Predicting the Solute Composition of the Saturation Extract from Soil Undergoing Salinization¹

ABSTRACT

A procedure utilizing a 1620 IBM computer was developed to predict the concentrations of Ca²⁺, Mg²⁺, and Na⁺ in saturated extracts from soils undergoing salinization with waters containing Cl^- and SO₄^2- salts of one or more of the above cations. This procedure was used to predict the concentration in saturated extracts for soils to be salinized with various mixtures of salts. These predicted values were in agreement with experimentally determined values both in systems where the salts remained in solution and where gypsum was precipitated. This procedure lends itself to routine analysis, and it should be possible to extend it to include other ions and slightly soluble salts that frequently are found in nature.

¹ Contribution from the Department of Irrigation, University of California, Davis. This work was supported by funds from California State Department of Water Resources and the Water Resources Center of the University of California. Presented before Div. II, Soil Science Society of America, Ithaca, New York. Aug. 21, 1962.

² Assistant Research Irrigationist and Professor of Irrigation, respectively.

Received for publication December 6, 1962. Accepted for publication January 8, 1963.