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Twelve Soil Orders - TwelveSoilorders PicturesfromNRCS...

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Twelve Soil orders Pictures from NRCS Natural Resources Conserva8on Service h:p://soils.usda.gov/technical/classifica8on/orders/
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En8sol – rec”ent” Soils that have li:le or no evidence of development of pedogenic horizons. Many are sandy or very shallow. Mountains etc
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Incep8sol L. Inceptum ‐ beginning Beginning soils Few diagnos8c horizons
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Alfisol Old classifica8on – pedalfer Mature, well weathered Deciduous / savannah Bases are high .
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Ul8sol L. “ul8mus” ‐ last Mature soil Good horizona8on B horizon contains an appreciable amount of translocated silicate clay Weathered ‐ few bases
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Mollisol L. “mollis” soU Soils that have a dark colored surface horizon and are base rich. Grasslands ‐ prairie soil Deep “A” Rich in bases fer8le
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Aridosol L. “aridos” dry Too dry for mesophy8c (moderately moist) plants to grow. They have either: (1) an aridic moisture regime or (2) A salic horizon (3) NOT cold
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Andisol think “andes” Japanese “ando black soil They include weakly weathered soils on volcanic glass, ash and cinders Fairly recent
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