USDA soil taxonomy

USDA Soil Taxonomy

USDA soil taxonomy

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Description:
USDA Soil Taxonomy developed by 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.

Example of classification of a soil type

Order: Entisols
Suborder: Fluvents
:Great Group: Torrifluvents
::Subgroup: Typic Torrifluvents
:::Family: Fine-loamy, mixed, superactive, calcareous, Typic Torrifluvents
::::Series: Jocity, Youngston.


Another Example

Order: Alfisols
Suborder: Xeralfs
:Great Group: Durixeralfs
::Subgroup: Abruptic Durixeralfs
:::Family: Fine, Mixed, Active, thermic Abruptic Durixeralfs
::::Series: San Joaquin
Link to Official Series Description: ftp://ftp-fc.sc.egov.usda.gov/NSSC/StateSoil_Profiles/ca_soil.pdf

Orders



  • Alfisols — form in semiarid to humid areas, typically under a hardwood forest cover.
  • Andisols — soils formed in volcanic ash and defined as soils containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite and ferrihydrite
  • Aridisols — (from the Latin aridus, for “dry”) form in an arid or semi-arid climate.
  • Entisols — are soils that do not show any profile development other than an A horizon
  • Gelisols — are soils of very cold climates which are defined as containing permafrost within two meters of the soil surface.
  • Histosols — a soil consisting primarily of organic......
  • ...

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