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Custom Soil Resource Report <br />Green manure crop (agronomy) <br />A soil -improving crop grown to be plowed under in an early stage of maturity or <br />soon after maturity. <br />Ground water <br />Water filling all the unblocked pores of the material below the water table. <br />Gully (map symbol) <br />A small, steep -sided channel caused by erosion and cut in unconsolidated <br />materials by concentrated but intermittent flow of water. The distinction between <br />a gully and a rill is one of depth. A gully generally is an obstacle to farm machinery <br />and is too deep to be obliterated by ordinary tillage whereas a rill is of lesser depth <br />and can be smoothed over by ordinary tillage. <br />Hard bedrock <br />Bedrock that cannot be excavated except by blasting or by the use of special <br />equipment that is not commonly used in construction. <br />Hard to reclaim <br />Reclamation is difficult after the removal of soil for construction and other uses. <br />Revegetation and erosion control are extremely difficult. <br />Hardpan <br />A hardened or cemented soil horizon, or layer. The soil material is sandy, loamy, <br />or clayey and is cemented by iron oxide, silica, calcium carbonate, or other <br />substance. <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 />M <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 rotation <br />is established. These crops return large amounts of organic matter to the soil. <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 a <br />well defined outline. Slopes are generally more than 15 percent. The distinction <br />between a hill and a mountain is arbitrary and may depend on local usage. <br />34 <br />