For use in all LRRs, except for W, X, and Y; for testing in LRRs W, X, and Y.
Redox depletions with value of 5 or more and chroma of 2 or less in a layer that is 10 cm (4 inches) or more thick, starting at a depth of 20 cm (8 inches) or less from the mineral soil surface, and has:
1. matrix value of 3 or less and chroma of 1 or less and 10 percent or more redox depletions, or
2. matrix value of 3 or less and chroma of 2 or less and 20 percent or more redox depletions.
User Notes: Care should be taken not to mistake mixing of an E or calcic horizon into the surface layer for depletions. The pieces of E and calcic horizons are not redox depletions. Knowledge of local conditions is helpful in areas where E and/or calcic horizons may be present. In soils that are wet because of subsurface saturation, the layer directly below the dark surface layer will typically have a depleted or gleyed matrix. Redox depletions should have associated redox concentrations (see figs. 32 and 33) that occur as Fe pore linings or masses within the depletion(s) or surrounding the depletion(s).