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_:vb670475561
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USDA textural classes of soils
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Some authorities consider this a soil composed of 0-20% of sand, 40-60% of silt and 40-60% of clay. If the proportion of silt exceeds that of clay, it is unclear whether this is still considered clay (due to other properties) or whether a new class "clay silt" should be created.
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https://www.fao.org/fishery/docs/CDrom/FAO_Training/FAO_Training/General/x6706e/x6706e06.htm