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  Encyclopedia of Keywords > Nature > Matter > Soil > Hardpan   Michael Charnine

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  1. A hardpan is a hardened layer of soil that prevents drainage.
  2. Hardpan is a subsoil that is rocklike and impenetrable.
  3. Hardpan is a layer of clay or minerals that water cannot pass through easily.
  4. Hardpan is a dense layer of soil that restricts root growth and the movement of moisture, air and beneficial organisms through the soil.
  5. Hardpan is a mixture of clay, silt, sand, and gravel.


  1. These constituents may then accumulate to form a hardpan or iron band. (Web site)
  2. Redder in the surface and denser hardpan than associated Madera soil. (Web site)
  3. Words Dictionary hardpan ( h--rd ' p--n ') n.
  4. For more information on hardpan, visit
  5. Hardpan Hardpan Fnd This article needs additional citations for verification.


  1. A red clay loam layer above the hardpan was recognized. (Web site)
  2. They are underlain by a heavy, clay hardpan - an almost impermeable layer of fine-textured, hardened clay particles. (Web site)
  3. The hardpan forms as fine clay particles, along with suspended minerals within the surface soil are leached down to the 'subsoil. (Web site)


  1. The subsoil rests abruptly on a mainly silica-cemented hardpan at depths ranging from 20 to 40 inches. (Web site)
  2. In addition, an increase in clay content of the subsoil above the hardpan was described in some places. (Web site)


  1. There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water.
  2. Common salts such as sodium molecules contained in wastewater can fulfil this roll and lead to a localized hardpan in some soil types.


  1. Others are man-made, such as hardpan formed by repeated plowing or heavy traffic that compacts the soil. (Web site)
  2. Hardpan can occur naturally or be caused by repeated cultivation with a tiller or plow.

Soil Horizon

  1. The USDA says that hardpan is a hardened or cemented soil horizon, or layer.
  2. A duripan is a diagnostic soil horizon that is cemented by illuvial silica into a subsurface hardpan .


  1. Florida hardpan is a common rock that most often looks like a sandy clod.
  2. In soil science, agriculture and gardening, hardpan is a general term for a dense layer of soil, residing usually below the uppermost topsoil layer.
  3. Hardpan can be a problem in farming and gardening, by impeding drainage of water and restricting the growth of plant roots. (Web site)
  4. In these situations, the hardpan can be broken up by either mechanical means such as digging or plowing, or through the use of soil amendments.
  5. The hardpan can be a few inches to a few feet below the ground surface.


  1. Encyclopedia of Keywords > Nature > Matter > Soil
  2. Glossaries > Glossary of Soil Science /
  3. Books about "Hardpan" in

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  Short phrases about "Hardpan"
  Originally created: April 03, 2008.
  Links checked: June 14, 2013.
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