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Chemical and Mineralogical Studies on Slick Spot Soils in Idaho¹

ABSTRACT

A study of a slick spot and associated soils showed the slick spot soil to be characterized by high salts and exchangeable Na throughout the profile whereas the high concentration of salts and exchangeable Na occurred at progressively greater depths in the profile in proceeding from the slick spot into the adjacent associated soils.

They clay-size minerals found in both the slick spot soils and the associated soils were illite, montmorillonite, kaolinite, quartz and feldspars. Montmorillonite maxima occurred at progressively lower depths in the profile in proceeding from the slick spot into the associated soils.

Partial dissolution studies on the clay-size fraction of the soils showed large amounts of amorphous material with the greatest amount being present in the slick spot soil. It was postulated that this amorphous material together with the high Na content contributed to the impermeability of these soils.

¹ Idaho Agr. Exp. Sta. Research Paper No. 566. Contribution from the Department of Agricultural Chemistry, University of Idaho, and Agronomy Department, Purdue University. Portion of a dissertation presented by the senior author as partial fulfillment of the requirements for the Ph.D. degree at Purdue University. Presented before Div. II and V, Soil Sci. Soc. Am., Ithaca, N.Y., Aug. 20, 1962.

² Associate Professor of Soils, University of Idaho, and Agronomist, Purdue University, respectively.

Received for publication December 20, 1963. Accepted for publication June 25, 1964.