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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).
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.
Palygorskite or attapulgite is a magnesium aluminium phyllosilicate with the chemical formula (Mg, Al)2 Si 4 O 10(O H )·4 ( H 2 O) that occurs in a type of clay soil common to the Southeastern United States. It is one of the types of fuller's earth. Some smaller deposits of this mineral can be found in Mexico, where its use is tied to the ...
The Unified Soil Classification System ( USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt ): If the ...
Kaolinite ( / ˈkeɪ.ələˌnaɪt, - lɪ -/ KAY-ə-lə-nyte, -lih-; also called kaolin) [ 5][ 6][ 7] is a clay mineral, with the chemical composition: Al 2 Si 2 O 5 ( OH) 4. It is a layered silicate mineral, with one tetrahedral sheet of silica ( SiO4) linked through oxygen atoms to one octahedral sheet of alumina ( AlO6 ).
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. [ 1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols. Soils with smectite clay minerals, including montmorillonite and ...
A Quaternary clay deposit in Estonia, laid down about 400,000 years ago. Clay is a type of fine-grained natural soil material containing clay minerals [ 1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 ( OH) 4 ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities ...
Tifton soils are on nearly level to gently sloping uplands of the Southern Coastal Plain. They formed in loamy sediments of marine origin. When this series was identified in 1909 it was recognized as one of the best soils for cotton, which at the time was a most important cash crop. [1] At present, Tifton soils are among the most agriculturally ...