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Published in Soil Sci Soc Am J 51:896-900 (1987)
© 1987 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Exchangeable Cation and Electrolyte Concentration on Mineralogy of Clay Dispersed from Aggregates1

O. M. Ali, M. Yousaf and J. D. Rhoades2

ABSTRACT

The type of clay dispersed from aggregates of various arid land soils as influenced by sodium adsorption ratio (SAR) and electrolyte concentration was evaluated in Ca-Na and Mg-Na systems. It was observed that, in general, in the case of Fallbrook I, Fallbrook II, Pachappa, and Arlington soils, all the common clay minerals (kaolinite, clay mica, vermiculite, and montmorillonite) dispersed whenever disaggregation occurred inrrespective of SAR and electrolyte concentration levels. In Bonsall soil, kaolinite and mica clays were apparently more dispersive than montmorillonite, which, in turn, was more dispersive than mixed layer clays in Ca-NaCl solutions. More intense x-ray diffraction peaks were obtained, in general, in the Mg-Na system compared to the Ca-Na system.

NOTES

1 Contribution from the U.S. Salinity Laboratory, USDA-ARS, Riverside, CA, 92501. This research was supported by a grant from the United States-Israel (Binational) Agricultural Research and Development Fund (BARD).

2 Postdoctoral Fellow, Graduate Student, and Research Leader, respectively. The permanent address of the senior author is Assistant Professor, Faculty of Agriculture, Suez Canal Univ., Ismailia, Egypt. The permanent address of the junior author is Associate Professor, Soil Science, Barani Agricultural College, Rawalpindi, Pakistan.

Received for publication May 29, 1985.




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