Abstract
AbstractA 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+, SO42‐ 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.
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