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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. 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.

  5. 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 ...

  6. Sapric - Wikipedia

    en.wikipedia.org/wiki/Sapric

    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.

  7. Shrink–swell capacity - Wikipedia

    en.wikipedia.org/wiki/Shrink–swell_capacity

    If a soil is composed of at least 5 percent of these clay minerals by weight, it could have the ability to shrink and swell. [3] This property is measured using coefficient of linear extensibility (COLE) values. If a soil has a COLE value greater than 0.06, then it can cause structural damage. [2] A COLE value of 0.06 means that 100 inches of ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Drummer (soil) - Wikipedia

    en.wikipedia.org/wiki/Drummer_(soil)

    Drummer soil is the most abundant and extensive soil in Illinois. It occurs over more than 1,500,000 acres (6,100 km 2) in the state. It is the most productive soil in the state. Corn and soybeans are the principal crops grown in Drummer soil. The average annual precipitation in areas of Drummer soil ranges from 32 to 40 inches (1,000 mm).

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