“All Soils” refers to soil layers with any USDA soil texture.
All mineral layers above any of the layers meeting the requirements of any A indicator, except for indicators A16 and A18, have a dominant chroma of 2 or less, or the thickness of the layers with a dominant chroma of more than 2 is less than 15 cm (6 inches). In addition, nodules and concretions are not considered to be redox concentrations for the application of the indicators.
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