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Effect of Mineral Weathering on the Response of Sodic Soils to Exchangeable Magnesium¹

ABSTRACT

The clay dispersivity and hydraulic conductivity (HC) properties of three California soils were studied as a function of exchangeable Na and electrolyte concentration in Na/Ca and Na/Mg systems. Soils that are relatively stable chemically are concluded to be the most sensitive to low levels of exchangeable Na and to the "specific" effect of exchangeable Mg when leached with distilled water. The results agree with the hypothesis that the susceptibility of soils to HC decreases produced by exchangeable Na and exchangeable Mg depends on their rates of mineral dissolution. Exchangeable Mg reduces the dissolution rates of noncalcareous soils and increases soil susceptibility to exchangeable Na under conditions of low electrolyte concentrations.

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

² Visiting Soil Scientists and Supervisory Soil Scientist, respectively. The permanent address of N. Alperovitch and I. Shainberg is Institute of Soils and Water, ARO, Bet-Dagan, Israel.

Received for publication August 5, 1985.