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Leaching Requirement for Exchangeable-Sodium Control¹

ABSTRACT

A method is described for estimating the leaching fraction required to keep the sodium-adsorption-ratio (SAR) at the lower limit of the plant-rooting zone below some limiting value. The choice of the limiting SAR depends on plant tolerances to sodium and on soil permeability. The method is based on an equation that satisfactorily predicts the SAR values of waters draining from a calcareous soil under various leaching regimes.

¹ Contribution from the US Salinity Laboratory, Soil & Water Conservation Research Division, ARS, USDA, Riverside, Calif. This research was presented in part at the Western Soil Science Society meetings in Los Angeles, Calif., June 21, 1967.

² Soil Chemist, US Salinity Laboratory, Riverside, Calif.

Received for publication December 5, 1967. Accepted for publication April 23, 1968.