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Custom Soil Resource Report <br /> 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 /> 48 <br />