B horizon
the subsoil in a soil profile.
noun
the layer of a soil profile immediately below the a horizon, containing deposits of leached material
b horizon
in abc soil, the second and middle zone, characterized by an acc-mulation of soluble or suspended organic material, clay, iron, or aluminum. these materials originate in the a horizon and are transported to the b horizon through the process of eluviation. b horizons often have a blocky structure and are reddish in color due to the presence of oxidized metals. also called zone of acc-mulation, zone of illuviation.
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