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Custom Soil Resource Report <br /> occur as a single, isolated mass or in a group forming a chain or range. <br /> Mountains are formed primarily by tectonic activity and/or volcanic action but <br /> can also be formed by differential erosion. <br /> Muck <br /> Dark, finely divided, well decomposed organic soil material. (See Sapric soil <br /> material.) <br /> Mucky peat <br /> See Hemic soil material. <br /> Mudstone <br /> A blocky or massive, fine grained sedimentary rock in which the proportions of <br /> clay and silt are approximately equal. Also, a general term for such material as <br /> clay, silt, claystone, siltstone, shale, and argillite and that should be used only <br /> when the amounts of clay and silt are not known or cannot be precisely <br /> identified. <br /> Munsell notation <br /> A designation of color by degrees of three simple variables—hue, value, and <br /> chroma. For example, a notation of 10YR 6/4 is a color with hue of 10YR, value <br /> of 6, and chroma of 4. <br /> Natric horizon <br /> A special kind of argillic horizon that contains enough exchangeable sodium to <br /> have an adverse effect on the physical condition of the subsoil. <br /> Neutral soil <br /> A soil having a pH value of 6.6 to 7.3. (See Reaction, soil.) <br /> Nodules <br /> See Redoximorphic features. <br /> Nose slope (geomorphology) <br /> A geomorphic component of hills consisting of the projecting end (laterally <br /> convex area) of a hillside. The overland waterflow is predominantly divergent. <br /> Nose slopes consist dominantly of colluvium and slope-wash sediments (for <br /> example, slope alluvium). <br /> Nutrient, plant <br /> Any element taken in by a plant essential to its growth. Plant nutrients are <br /> mainly nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, <br /> manganese, copper, boron, and zinc obtained from the soil and carbon, <br /> hydrogen, and oxygen obtained from the air and water. <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 /> 56 <br />