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Custom Soil Resource Report <br /> 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 /> 69 <br />