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Percolation <br />The movement of water through the soil. <br />Perennial water (map symbol) <br />Small, natural or constructed lakes, ponds, or pits that contain water most of the <br />year. <br />Permafrost <br />Ground, soil, or rock that remains at or below 0 degrees C for at least 2 years. It <br />is defined on the basis of temperature and is not necessarily frozen. <br />pH value <br />A numerical designation of acidity and alkalinity in soil. (See Reaction, soil.) <br />Phase, soil <br />A subdivision of a soil series based on features that affect its use and <br />management, such as slope, stoniness, and flooding. <br />Piping <br />Formation of subsurface tunnels or pipelike cavities by water moving through <br />the soil. <br />Pitting <br />Pits caused by melting around ice. They form on the soil after plant cover is <br />removed. <br />Plastic limit <br />The moisture content at which a soil changes from semisolid to plastic. <br />Plasticity index <br />The numerical difference between the liquid limit and the plastic limit; the range <br />of moisture content within which the soil remains plastic. <br />Plateau (geomorphology) <br />A comparatively flat area of great extent and elevation; specifically, an extensive <br />land region that is considerably elevated (more than 100 meters) above the <br />adjacent lower lying terrain, is commonly limited on at least one side by an <br />abrupt descent, and has a flat or nearly level surface. A comparatively large <br />part of a plateau surface is near summit level. <br />Playa <br />The generally dry and nearly level lake plain that occupies the lowest parts of <br />closed depressions, such as those on intermontane basin floors. Temporary <br />flooding occurs primarily in response to precipitation and runoff. Playa deposits <br />are fine grained and may or may not have a high water table and saline <br />conditions. <br />Custom Soil Resource Report <br />52 Index #10