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48a • 1-GLOSSARY OF SOIL TERhLS Available Water The capacity to store water available for use by Capacity (AWC) plants, usually expressed (inches of water per inch of soil depth) in linear depths of water per unit depth of soil. Aridisols Mineral soils that have an aridic moisture regime, an ochric epipedon, and other pedogenic horizons. (An order in the USDA soil taxonomy) Horollic Descriptive intergradation sub group term used to delineate soils that posess darker colored A-horizons than the typical Great Group Semiarid soils. Boundary The distinctness of separation between natural soil horizons. Cambic Horizon An altered subsurface horizon in which the texture of the fine earth fraction is loamy very fine sand or finer. Alteration may be either chemical or physical. Camborthids A mineral soil belonging to the Aridisol order which contains an ochric epipedon and a Iambic subsurface soil horizon. Clay A mineral soil separate cronsisting of particles less than 0.002 millimeters in diameter. As a soil textural class, soil material that is 40 percent or rrore clay, less than 45 percent sand, and less than 40 percent silt. Consistence The degree of cohesion or adhesion of the soil mass or the resistance of natural soil structure to deformation or rupture. Fhtisols Mineral soils that have no distinct pedogenic horizons within 1 meter (40 inches) of the soil surface. (An order in the USDA soil taxonomy.) Frigid A soil temperature regime that has mean annual soil temperatures of more than 0°C but less than SoC, more than 5°C difference between mean summer and mean winter soil tenperatures at 50 cm, and warm sumrer temperatures. 2 (factor) Wind erodibility factor for use in the wind erosion equation. (See wind erosion equation). a K (factor) A comparative value of a soils erosion susceptibility by water' theoretical values range from 0.00 to 1.00 with an increase in suspectibility as the value increases. Values less than 0.15 indicate low suspectibility; values greater than 0.35 indicate high erodibility. (See soil loss equation).