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  2. Ultisol - Wikipedia

    en.wikipedia.org/wiki/Ultisol

    Map of the United States showing what percentage of the soil in a given area is classified as an Ultisol-type soil. The great majority of the land area classified in the highest category (75%-or-greater Ultisol) lies in the South and overlays with the Piedmont Plateau, which runs as a diagonal line through the South from southeast (in Alabama) to northwest (up into parts of Maryland).

  3. List of U.S. state soils - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_soils

    This is a list of U.S. state soils. A state soil is a soil that has special significance to a particular state. Each state in the United States has selected a state soil, twenty of which have been legislatively established. These official state soils share the same level of distinction as official state flowers and birds.

  4. Claypan - Wikipedia

    en.wikipedia.org/wiki/Claypan

    Plants with shallow roots, might not withstand the soil contraction forces due to the shrinkage of clay in the dry season. The low water infiltration rate and hydraulic conductivity may lead to a perched water table form on top of the claypan layer. Water in the perched water table evaporates instead of uptake by plants, especially in the dry ...

  5. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    The soil moisture regime, often reflective of climatic factors, is a major determinant of the productivity of terrestrial ecosystems, including agricultural systems. The soil moisture regimes are defined based on the levels of the groundwater table and the amounts of soil water available to plants during a given year in a particular region.

  6. Red soil - Wikipedia

    en.wikipedia.org/wiki/Red_soil

    Red soil in India. Red soil is a type of soil that typically develops in warm, temperate, and humid climates and comprises approximately 13% of Earth's soils. [1] It contains thin organic and organic-mineral layers of highly leached soil resting on a red layer of alluvium.

  7. Soil in the United States - Wikipedia

    en.wikipedia.org/wiki/Soil_in_the_United_States

    Drainage is usually good and trafficability is usually superior in the coarser-textured soils. While some of the clay in a soil may have been inherited in the parent material, older soils might contain a significant amount of clay formed by weathering processes during soil formation. Soils with a high concentration of clay and organic matter ...

  8. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    Irrigating soil above field capacity risks percolation losses. Wilting point describes the dry limit for growing plants. During growing season, soil moisture is unaffected by functional groups or specie richness. [63] Available water capacity is the amount of water held in a soil profile

  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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