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Dystrustept TH

A soil profile of a well drained, loamy Dystrustept in Thailand. This soil has an ochric epipedon about 12 to 15 cm thick underlain by a cambic subsoil horizon that extends to a depth of about 35 cm. A paralithic contact with soft, weathered bedrock is at a depth of about 35 cm. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)

 

Dystrustepts—These are the acid Ustepts with low base saturation and relatively low natural fertility. They developed mostly in Pleistocene or Holocene deposits. Some of the soils with steep slopes formed in older deposits. Parent materials generally are acid, moderately or weakly consolidated sedimentary or metamorphic rocks or acid sediments. The vegetation was mostly forest. Most of these soils have warm or very warm temperatures. A common horizon sequence in Dystrustepts is an ochric (typically thin and/or light-colored) epipedon over a cambic (minimal soil development) subsoil horizon. Some of the steeper soils are shallow to rootlimiting bedrock or a dense, compact layer. In the United States, Dystrustepts are found mostly in coastal California and in Hawaii. A few are in the Rocky Mountains and on the Great Plains.

 

For additional information about soil classification, visit:

www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...

 

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Uploaded on August 3, 2021