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Custom Soil Resource Report <br />Texture, soil <br />The relative proportions of sand, silt, and clay particles in a mass of soil. The basic <br />textural classes, in order of increasing proportion of fine particles, are sand, loamy <br />sand, sandy loam, loam, silt loam, silt, sandy clay loam, clay loam, silty clay loam, <br />sandy clay, silty clay, and clay. The sand, loamy sand, and sandy loam classes <br />may be further divided by specifying "coarse," "fine," or "very fine." <br />Thin layer <br />Till <br />Otherwise suitable soil material that is too thin for the specified use. <br />Dominantly unsorted and nonstratified drift, generally unconsolidated and <br />deposited directly by a glacier without subsequent reworking by meltwater, and <br />consisting of a heterogeneous mixture of clay, silt, sand, gravel, stones, and <br />boulders; rock fragments of various lithologies are embedded within a finer matrix <br />that can range from clay to sandy loam. <br />Till plain <br />An extensive area of level to gently undulating soils underlain predominantly by <br />till and bounded at the distal end by subordinate recessional or end moraines. <br />Tilth, soil <br />The physical condition of the soil as related to tillage, seedbed preparation, <br />seedling emergence, and root penetration. <br />Toeslope <br />The gently inclined surface at the base of a hillslope. Toeslopes in profile are <br />commonly gentle and linear and are constructional surfaces forming the lower part <br />of a hillslope continuum that grades to valley or closed -depression floors. <br />Topsoil <br />The upper part of the soil, which is the most favorable material for plant growth. <br />It is ordinarily rich in organic matter and is used to topdress roadbanks, lawns, <br />and land affected by mining. <br />Trace elements <br />Chemical elements, for example, zinc, cobalt, manganese, copper, and iron, in <br />soils in extremely small amounts. They are essential to plant growth. <br />Tread <br />The flat to gently sloping, topmost, laterally extensive slope of terraces, flood -plain <br />steps, or other stepped landforms; commonly a recurring part of a series of natural <br />steplike landforms, such as successive stream terraces. <br />Tuff <br />A generic term for any consolidated or cemented deposit that is 50 percent or <br />more volcanic ash. <br />56 <br />