USDA soil taxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series. The classification was originally developed by Guy Donald Smith, former director of the U.S. Department of Agriculture's soil survey investigations.[1]
^Donovan, Alan (1981-08-29). "Guy D. Smith, 73, USDA Soil Expert, Dies". Washington Post. ISSN 0190-8286. Retrieved 2017-11-15.
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USDAsoiltaxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification...
1938 soiltaxonomy divided soils into three orders dependent on dominant soil forming factors. Intrazonal soils have more or less well-defined soil profile...
criteria. USDAsoiltaxonomy provides the core criteria for differentiating soil map units. This is a substantial revision of the 1938 USDAsoiltaxonomy which...
Reference Base for Soil Resources (WRB) and the USDAsoiltaxonomy. Other systems do not ask whether the properties are the result of soil formation or not...
requirements. Soil texture focuses on the particles that are less than two millimeters in diameter which include sand, silt, and clay. The USDAsoiltaxonomy and...
The FAO soil classification, in turn, borrowed from modern soil classification concepts, including USDAsoiltaxonomy. WRB is based mainly on soil morphology...
order in USDAsoiltaxonomy. They are soils of very cold climates which are defined as containing permafrost within two meters of the soil surface. The...
examples are the World Reference Base for Soil Resources (WRB), the USDAsoiltaxonomy and the Australian Soil Classification. Diagnostic horizons are usually...
Oxisols are a soil order in USDAsoiltaxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator...
AASHTO Soil Classification System AASHTO ASTM International USDASoilTaxonomy (Soil classification for agricultural purposes) Classification of Soils for...
Inceptisols are a soil order in USDAsoiltaxonomy. They form quickly through alteration of parent material. They are more developed than Entisols. They...
A vertisol is a Soil Order in the USDAsoiltaxonomy and a Reference Soil Group in the World Reference Base for Soil Resources (WRB). It is also defined...
A fragipan is a diagnostic horizon in USDAsoiltaxonomy. They are altered subsurface soil layers that restrict water flow and root penetration. Fragipans...
Aridisols (or desert soils) are a soil order in USDAsoiltaxonomy. Aridisols (from the Latin aridus, for "dry", and solum) form in an arid or semi-arid...
Solonetz Vertisols USDAsoiltaxonomy International Committee on Anthropogenic Soils (ICOMANTH) Soil types World Reference Base for Soil Resources World...
40 cm. In the USDAsoiltaxonomy, sapric may be a subtype of a haplohemist or glacistel type, and may also be a diagnostic organic soil material where...
USDAsoiltaxonomy' from 1960. The next step was the Revised Legend of the Soil Map of the World, published in 1988. In 1982, the International Soil Science...
Entisols are soils, as defined under USDAsoiltaxonomy, that do not show any profile development other than an A-horizon (or “A” horizon). Entisols have...
The US soiltaxonomic hierarchy includes orders, suborders, great groups, subgroups, families and series, with each series representing a unique kind of...
petrocalcic horizon is a diagnostic horizon in the USDAsoiltaxonomy (ST) and in the World Reference Base for Soil Resources (WRB). They are formed when secondary...
A duripan is a diagnostic soil horizon of the USDAsoiltaxonomy that is cemented by illuvial silica into a subsurface hardpan. Similar to a fragipan,...
In USDAsoiltaxonomy, a Psamment is defined as an Entisol which consists basically of unconsolidated sand deposits, often found in shifting sand dunes...
in the USDASoilTaxonomy classification system hierarchy. The actual object of classification is the so-called soil individual, or pedon. Soil series...
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