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Custom Soil Resource Report <br /> Alluvial fan <br /> A low, outspread mass of loose materials and/or rock material, commonly with <br /> gentle slopes. It is shaped like an open fan or a segment of a cone. The <br /> material was deposited by a stream at the place where it issues from a narrow <br /> mountain valley or upland valley or where a tributary stream is near or at its <br /> junction with the main stream. The fan is steepest near its apex, which points <br /> upstream, and slopes gently and convexly outward (downstream)with a gradual <br /> decrease in gradient. <br /> Alluvium <br /> Unconsolidated material, such as gravel, sand, silt, clay, and various mixtures of <br /> these, deposited on land by running water. <br /> Alpha,alpha-dipyridyl <br /> A compound that when dissolved in ammonium acetate is used to detect the <br /> presence of reduced iron (Fe II) in the soil. A positive reaction implies reducing <br /> conditions and the likely presence of redoximorphic features. <br /> Animal unit month (AUM) <br /> The amount of forage required by one mature cow of approximately 1,000 <br /> pounds weight, with or without a calf, for 1 month. <br /> Aquic conditions <br /> Current soil wetness characterized by saturation, reduction, and redoximorphic <br /> features. <br /> Argillic horizon <br /> A subsoil horizon characterized by an accumulation of illuvial clay. <br /> Arroyo <br /> The flat-floored channel of an ephemeral stream, commonly with very steep to <br /> vertical banks cut in unconsolidated material. It is usually dry but can be <br /> transformed into a temporary watercourse or short-lived torrent after heavy rain <br /> within the watershed. <br /> Aspect <br /> The direction toward which a slope faces. Also called slope aspect. <br /> Association, soil <br /> A group of soils or miscellaneous areas geographically associated in a <br /> characteristic repeating pattern and defined and delineated as a single map <br /> unit. <br /> Available water capacity (available moisture capacity) <br /> The capacity of soils to hold water available for use by most plants. It is <br /> commonly defined as the difference between the amount of soil water at field <br /> moisture capacity and the amount at wilting point. It is commonly expressed as <br /> inches of water per inch of soil. The capacity, in inches, in a 60-inch profile or to <br /> a limiting layer is expressed as: <br /> 32 <br />