Capital letters designate the principal horizons as shown in Table P18.Table P18
Master soil horizons and layers in a profile
Organic horizons of minerals soils. Horizons (i) formed or forming in the upper part of mineral soils above the mineral part; (ii) dominated by fresh or partly decomposed organic materials; and (iii) containing more than 30 percent organic matter if the mineral fraction is more than 50 percent clay, or more than 20 percent organic matter if the mineral fraction has no clay. Intermediate clay content requires proportional organic matter content.
Organic horizons in which essentially the...
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