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Published in Soil Sci Soc Am J 30:313-317 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Solution Composition on the Swelling of Extracted Soil Clays1

B. L. McNeal, W. A. Norvell and N. T. Coleman2,3,

ABSTRACT

For soils containing expansible minerals, the swelling of extracted soil clays in mixed NaCl-CaCl2 solutions was well correlated with relative hydraulic conductivity of the soils to the same solutions, and with theoretical interlayer swelling values based on a "domain" model. In this model, mixed Na-Ca clays were considered to consist of discrete Na- and Ca-regions, with only the Na-regions swelling at low salt concentrations. The correlations suggest that the most plausible mechanism for hydraulic conductivity decreases in soils containing significant amounts of expansible minerals is the closing of conducting pores by insitu mineral swelling. However, a dispersion process activated by the interlayer swelling of expansible minerals would also be compatible with the data.

NOTES

1 Joint contribution from the US Salinity Laboratory, SWCRD, ARS, USDA, and the Department of Soils and Plant Nutrition, University of California, Riverside. Part of this research is from the doctoral dissertation of the senior author. Presented before Div. S-1 and S-2, Soil Science Society of America, Nov. 1, 1965, at Columbus, Ohio.

2 Soil Scientists, U S Salinity Laboratory, Riverside, California, and Professor of Soils and Plant Nutrition, University of California, Riverside.

3 Sincere appreciation is expressed to C. A. Bower and J. T. Hatcher for supplying the SAR-ESP data used herein.

Received for publication October 15, 1965. Accepted for publication January 31, 1966.






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