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Custom Soil Resource Report <br />Organic matter <br />Plant and animal residue in the soil in various stages of decomposition. The <br />content of organic matter in the surface layer is described as follows: <br />Very Iowa Less than 0.5 percent <br />Low: 0.5 to 1.0 percent <br />Moderately low: 1.0 to 2.0 percent <br />Moderate: 2.0 to 4.0 percent <br />High: 4.0 to 8.0 percent <br />Very high: More than 8.0 percent <br />Outwash <br />Stratified and sorted sediments (chiefly sand and gravel) removed or "washed out" <br />from a glacier by meltwater streams and deposited in front of or beyond the end <br />moraine or the margin of a glacier. The coarser material is deposited nearer to <br />the ice. <br />Outwash plain <br />An extensive lowland area of coarse textured glaciofluvial material. An outwash <br />plain is commonly smooth; where pitted, it generally is low in relief. <br />Paleoterrace <br />An erosional remnant of a terrace that retains the surface form and alluvial <br />deposits of its origin but was not emplaced by, and commonly does not grade to, <br />a present-day stream or drainage network. <br />Pan <br />A compact, dense layer in a soil that impedes the movement of water and the <br />growth of roots. For example, hardpan, fragipan, claypan, plowpan, and traffic <br />pan. <br />Parent material <br />The unconsolidated organic and mineral material in which soil forms. <br />Peat <br />Unconsolidated material, largely undecomposed organic matter, that has <br />accumulated under excess moisture. (See Fibric soil material.) <br />Ped <br />An individual natural soil aggregate, such as a granule, a prism, or a block. <br />Pedisediment <br />A layer of sediment, eroded from the shoulder and backslope of an erosional <br />slope, that lies on and is being (or was) transported across a gently sloping <br />erosional surface at the foot of a receding hill or mountain slope. <br />43 <br />