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  2. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    Extragrade features are aberrant properties which prevent that soil from being included in another soil classification. About 1,000 soil subgroups are defined in the United States. [6] A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural ...

  3. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    Soil Classification Group Symbol Group Name COARSE-GRAINED SOILS. More than 50% retained on No.200 Sieve Gravels. More than 50% of coarse fraction on No. 4 Sieve Clean Gravels. Less than 5% fines Cu ≥ 4 and 1 ≤ Cc ≤ 3 GW Well-graded gravel Cu < 4 and/or Cc < 1 or Cc > 3 GP Poorly graded gravel Gravels with Fines. More than 12% fines

  4. Soil classification - Wikipedia

    en.wikipedia.org/wiki/Soil_classification

    Soil classification is a dynamic subject, from the structure of the system, to the definitions of classes, to the application in the field. Soil classification can be approached from the perspective of soil as a material and soil as a resource.

  5. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    The AASHTO Soil Classification System was developed by the American Association of State Highway and ... Group Classification A-1 A-3 A-2 A-4 A-5 A-6 A-7 A-1-a A-1-b ...

  6. Soil type - Wikipedia

    en.wikipedia.org/wiki/Soil_type

    A soil type is a taxonomic unit in soil science. All soils that share a certain set of well-defined properties form a distinctive soil type. [1] Soil type is a technical term of soil classification, the science that deals with the systematic categorization of soils. Every soil of the world belongs to a certain soil type. Soil type is an ...

  7. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from soil by restricting the former term specifically to displaced soil. Soil measuring and surveying device

  8. FAO soil classification - Wikipedia

    en.wikipedia.org/wiki/FAO_soil_classification

    The 106 Soil Units form 26 Soil Groups. The FAO soil map was a very simple classification system with units very broad, but was the first truly international system, and most soils could be accommodated on the basis of their field descriptions. The FAO soil map was intended for mapping soils at a continental scale but not at local scale.

  9. Vertisol - Wikipedia

    en.wikipedia.org/wiki/Vertisol

    A vertisol is a Soil Order in the USDA soil taxonomy [1] and a Reference Soil Group in the World Reference Base for Soil Resources (WRB). [2] It is also defined in many other soil classification systems. In the Australian Soil Classification it is called vertosol. [3] The natural vegetation of vertisols is grassland, savanna, or grassy woodland ...

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