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A Characterization of the Sebree-Chilcott Soil Series Association (Slick Spots) in Idaho¹

ABSTRACT

A study was made of the Sebree-Chilcott soil series association of southwestern Idaho with respect to morphology, physiography, and physical and chemical properties.

Parent materials are of fluviatile and lacustrine origin occurring on terraces of different geologic age. The Sebree soil (slick spots) is relatively impermeable with little or no vegetation. Diameter of the spots vary from a few inches to 50 feet or more, with irregular shapes.

The soils studied exhibit solodized characteristics with textural and color B horizons of solonetz morphology overlying prominent CaCO₃ accumulations. Degree of cementation of the calcareous layers appears to be related to geologic age. The surface has a silt loam texture.

Slick spot soils have a very thin A₂ horizon overlying thicker B₂ layers characterized by high exchangeable Na and in most cases high concentrations of soluble salts. Ions that predominate are Na⁺, SO₄^2- and Cl^-. Gypsum is present in the lower B₂ and B₃ horizons. Horizons of prominent lime accumulation have a bowl-shaped form under the slick spot. The data indicate that slick spots represent retarded soil-forming processes which have somehow resisted the efforts of nature in their normal development.

¹ Taken in part from a thesis submitted by Fred M. Sandoval, Jr., to the Graduate School of the University of Idaho in partial fulfillment of requirements for a MS degree. Idaho Agr. Exp. Sta. Research Paper 449. Presented before Div. V, Soil Science Society of America, Lafayette, Ind., Aug. 4, 1958.

² Formerly Research Technician, University of Idaho, now Soil Scientist, SWCRD, ARS, USDA, Mandan, N. D.; and Associate Professor of Soils and Assistant Professor in Agricultural Chemistry, University of Idaho, respectively. The authors express appreciation to Dr. Frank G. Viets, SWCRD, ARS, USDA, for helpful suggestions on the manuscript.

Received for publication August 18, 1958. Accepted for publication March 26, 1959.