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Head slope (geomorphology) <br />A geomorphic component of hills consisting of a laterally concave area of a <br />hillside, especially at the head of a drainageway. The overland waterflow is <br />converging. <br />Hemic soil material (mucky peat) <br />Organic soil material intermediate in degree of decomposition between the less <br />decomposed fibric material and the more decomposed sapric material. <br />High-residue crops <br />Such crops as small grain and corn used for grain. If properly managed, residue <br />from these crops can be used to control erosion until the next crop in the <br />rotation is established. These crops return large amounts of organic matter to <br />the soil. <br />Hill <br />A generic term for an elevated area of the land surface, rising as much as 1,000 <br />feet above surrounding lowlands, commonly of limited summit area and having <br />a well defined outline. Slopes are generally more than 15 percent. The <br />distinction between a hill and a mountain is arbitrary and may depend on local <br />usage. <br />Hillslope <br />A generic term for the steeper part of a hill between its summit and the drainage <br />line, valley flat, or depression floor at the base of a hill. <br />Horizon, soil <br />A layer of soil, approximately parallel to the surface, having distinct <br />characteristics produced by soil-forming processes. In the identification of soil <br />horizons, an uppercase letter represents the major horizons. Numbers or <br />lowercase letters that follow represent subdivisions of the major horizons. An <br />explanation of the subdivisions is given in the “Soil Survey Manual.” The major <br />horizons of mineral soil are as follows: <br />Custom Soil Resource Report <br />42 Index #10