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Plinthite <br />The sesquioxide-rich, humus-poor, highly weathered mixture of clay with quartz <br />and other diluents. It commonly appears as red mottles, usually in platy, <br />polygonal, or reticulate patterns. Plinthite changes irreversibly to an ironstone <br />hardpan or to irregular aggregates on repeated wetting and drying, especially if <br />it is exposed also to heat from the sun. In a moist soil, plinthite can be cut with a <br />spade. It is a form of laterite. <br />Plowpan <br />A compacted layer formed in the soil directly below the plowed layer. <br />Ponding <br />Standing water on soils in closed depressions. Unless the soils are artificially <br />drained, the water can be removed only by percolation or evapotranspiration. <br />Poorly graded <br />Refers to a coarse grained soil or soil material consisting mainly of particles of <br />nearly the same size. Because there is little difference in size of the particles, <br />density can be increased only slightly by compaction. <br />Pore linings <br />See Redoximorphic features. <br />Potential native plant community <br />See Climax plant community. <br />Potential rooting depth (effective rooting depth) <br />Depth to which roots could penetrate if the content of moisture in the soil were <br />adequate. The soil has no properties restricting the penetration of roots to this <br />depth. <br />Prescribed burning <br />Deliberately burning an area for specific management purposes, under the <br />appropriate conditions of weather and soil moisture and at the proper time of <br />day. <br />Productivity, soil <br />The capability of a soil for producing a specified plant or sequence of plants <br />under specific management. <br />Profile, soil <br />A vertical section of the soil extending through all its horizons and into the <br />parent material. <br />Proper grazing use <br />Grazing at an intensity that maintains enough cover to protect the soil and <br />maintain or improve the quantity and quality of the desirable vegetation. This <br />practice increases the vigor and reproduction capacity of the key plants and <br />Custom Soil Resource Report <br />53 Index #10