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Custom Soil Resource Report <br /> 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 /> 58 <br />