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Estimating Soil and Saturation Extract Composition by a Computer Method¹

ABSTRACT

Five soil samples were salinized with NaCl and CaSO₄.2H₂O. They were extracted at 1:1 and saturation moisture content, and the chemical composition of the soils and extracts was determined. Exchange constants, for Na-Ca and Mg-Ca exchange, in combination with chemical data derived from samples at 1:1 moisture content were used in a computer program to predict soil and extract composition at saturation. The computer procedure, developed by Dutt, proved very satisfactory in estimating chemical makeup at saturation.

¹ Contribution from the Department of Irrigation, University of California, Davis. This work was supported by funds from the California State Department of Water Resources and the Water Resources Center of the University of California.

² Assistant Research Irrigationist and Laboratory Technicians.

Received for publication May 13, 1965. Accepted for publication July 29, 1965.