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Dispersion of Clay From Some Salt-Affected, Arid Land Soil Aggregates¹

ABSTRACT

The dispersion characteristics of five arid land soils were determined upon reaction with solutions having various levels of electrolyte concentration, C (C = 0, 1, 4, 10, 30, 50, and 100 mmol_cL^–1), and sodium adsorption ratios, SAR (0, 5, 10, 20, and 40) with either Ca or Mg as the divalent counter-ion. With either divalent cation, clay dispersion increased as SAR increased and C decreased. Greater dispersion was observed with Mg as the divalent counter-ion due to the higher SAR and lower C levels, which resulted in the Mg systems compared to the Ca systems when the soils were reacted with comparable SAR and C treatment solutions. Dispersion threshold relations are concluded to be a useful criterion for screening soils for their sodicity hazard potentials.

¹ Contribution from the U.S. Salinity Lab., 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 Graduate student, Postdoctoral fellow, and Research Leader, respectively. The permanent address of the senior author is Associate Professor, Soil Science, Barani Agricultural College, Rawalpindi, Pakistan. The permanent address of the junior author is Assistant Professor, Suez Canal Univ., Ismailia, Egypt.

Received for publication May 29, 1985.

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