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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.
Examples are the World Reference Base for Soil Resources [4] (WRB) and the USDA soil taxonomy. [5] Other systems do not ask whether the properties are the result of soil formation or not. An example is the Australian Soil Classification. [6] A convenient way to define a soil type is referring to soil horizons. However, this is not always ...
Soil taxonomy based soil map units are additionally sorted into classes based on technical classification systems. Land Capability Classes, hydric soil, and prime farmland are some examples. The European Union uses the World Reference Base for Soil Resources (WRB), currently the fourth edition is valid. [5]
USDA soil taxonomy Entisols are soils , as defined under USDA soil taxonomy , that do not show any profile development other than an A-horizon (or “A” horizon). Entisols have no diagnostic horizons, and are unaltered from their parent material, which could be unconsolidated sediment, or rock.
A sapric is a subtype of a histosol [1] where virtually all of the organic material has undergone sufficient decomposition to prevent the identification of plant parts and even fecal matter. [ 2 ] [ 3 ] Muck is a sapric soil that is naturally waterlogged or is artificially drained.
Mollisol is a soil type which has deep, high organic matter, nutrient-enriched surface soil (), typically between 60 and 80 cm (24-31 in) in depth.This fertile surface horizon, called a mollic epipedon, is the defining diagnostic feature of Mollisols.
Inceptisols are a soil order in USDA soil taxonomy. They form quickly through alteration of parent material. They are more developed than Entisols. [1] They have no accumulation of clays, iron oxide, aluminium oxide or organic matter. They have an ochric or umbric horizon and a cambic subsurface horizon.
Oxisols are a soil order in USDA soil taxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator. In the World Reference Base for Soil Resources (WRB), [1] they belong mainly to the ferralsols, but some are plinthosols or nitisols. Some oxisols have been previously classified as laterite ...