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Unformatted text preview: Master Horizons: O, A, E, B, C, R Know the principal features of each horizon Sub Horizons (added to master horizon designation) g gleying anaerobic (reduced) conditions, color, Fe h illuvial organic matter humic or organic accumulations (subsurface) p plowing plowing or disturbed t clay accumulation formed in place or illuviated w development of color/structure weak influence of clay, or oxides of Fe o oxic highly weathered, kaolinite, Fe/Al oxides Oa highly decomposed (sapric) higher carbon content, high surface area, reactive Oe moderately decomposed (hemic) Oi slightly decomposed (fibric) lower carbon content, low surface area, less reactive Examples: Bt accumulation of aluminosilicate clays in the subsurface Bh accumulation of organic matter in the subsurface Bo oxic horizon, high in kaolinite and Fe/Al oxides Ap disturbed surface horizon Btg Accumulation of clays under reduced conditions (color) Diagnostic Horizons Usage Surface: Mollic- thick, dark colored, high %B.S., good structureMollic- thick, dark colored, high %B....
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- Fall '08