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Effect of Mineral Weathering on Clay Dispersion and Hydraulic Conductivity of Sodic Soils¹

ABSTRACT

Three soils were chosen to test the hypothesis that differences in rates of mineral dissolution among soils may account for much of the observed differences in their susceptibilities to hydraulic conductivity decreases when leached with distilled water. Our results agreed reasonably well with the hypothesis. Differences between soils in their ability to release salt and to undergo dispersion are probably especially important in affecting crust formation under rainfall conditions.

¹ Contribution from the U.S. Salinity Laboratory, USDA-SEA-AR, Riverside, CA 92501.

² Visiting Soil Scientist, Supervisory Soil Scientist, Geochemist, and Soil Scientist, respectively. I. Shainberg's permanent address is Institute of Soils & Water, ARO, The Volcani Center, Bet-Dagan, Israel.

Received for publication June 25, 1980. Accepted for publication November 4, 1980.