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Study Guide for Taxonomy - Master Horizons O A E B C R Know...

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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 structure
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