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Substratum <br />The part of the soil below the solum. <br />Subsurface layer <br />Any surface soil horizon (A, E, AB, or EB) below the surface layer. <br />Summer fallow <br />The tillage of uncropped land during the summer to control weeds and allow <br />storage of moisture in the soil for the growth of a later crop. A practice common <br />in semiarid regions, where annual precipitation is not enough to produce a crop <br />every year. Summer fallow is frequently practiced before planting winter grain. <br />Summit <br />The topographically highest position of a hillslope. It has a nearly level (planar <br />or only slightly convex) surface. <br />Surface layer <br />The soil ordinarily moved in tillage, or its equivalent in uncultivated soil, ranging <br />in depth from 4 to 10 inches (10 to 25 centimeters). Frequently designated as <br />the “plow layer,” or the “Ap horizon.” <br />Surface soil <br />The A, E, AB, and EB horizons, considered collectively. It includes all <br />subdivisions of these horizons. <br />Talus <br />Rock fragments of any size or shape (commonly coarse and angular) derived <br />from and lying at the base of a cliff or very steep rock slope. The accumulated <br />mass of such loose broken rock formed chiefly by falling, rolling, or sliding. <br />Taxadjuncts <br />Soils that cannot be classified in a series recognized in the classification <br />system. Such soils are named for a series they strongly resemble and are <br />designated as taxadjuncts to that series because they differ in ways too small to <br />be of consequence in interpreting their use and behavior. Soils are recognized <br />as taxadjuncts only when one or more of their characteristics are slightly <br />outside the range defined for the family of the series for which the soils are <br />named. <br />Terminal moraine <br />An end moraine that marks the farthest advance of a glacier. It typically has the <br />form of a massive arcuate or concentric ridge, or complex of ridges, and is <br />underlain by till and other types of drift. <br />Terrace (conservation) <br />An embankment, or ridge, constructed across sloping soils on the contour or at <br />a slight angle to the contour. The terrace intercepts surface runoff so that water <br />soaks into the soil or flows slowly to a prepared outlet. A terrace in a field <br />Custom Soil Resource Report <br />63 Index #10