12 Soil Orders (NRES 251)

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Short and sweet defining factors of each of the 12 soil orders!

Last updated 4:29 PM on 11/18/22
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12 Terms

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Alfisol
Moist, argillic subsurface found in deciduous forests and grasslands, dull tan color
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Andisol
Volcanic ash soil found near volcanoes, layers of reddish-brown and dark brown
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Aridisol
Arid climate, CaCO3 deposits, found in arid/dry areas, little weathering, dull grey color
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Entisol
Little or no soil development, featureless/sandy looking
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Gelisol
Permafrost, frozen soil, found in cold areas, greenish-grey color
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Histosol
High in organic matter, tissue, found in wetlands, darker in color; reddish-purple hue
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Inceptisol
Weak or little development, little weathering, brown -> grey gradient
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Mollisol
Grassland soil, high organic matter, found in grasslands and prairies, purply-brown color
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Oxisol
Highly weathered soil, found in Hawaii (in US), red/orange color
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Spodosol
Sandy, acidic forest soil, found in coniferous/deciduous forests, leached top layer, red/orange color below
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Ultisol
Leached with subsurface clay accumulation, found in forests (southeast US), red/brown color
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Vertisol
Swelling clay soil, found in grasslands, dark/black color without high organic matter

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