The B horizon is a soil layer found below the A horizon and above the C horizon. It is characterized by the accumulation of minerals such as iron, aluminum, and clay leached down from the A horizon.
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The B horizon is also known as the subsoil.
It typically contains less organic material than the A horizon but more mineral deposits.
Clay, iron, and aluminum oxides are commonly accumulated in this layer due to leaching from upper layers.
The texture of the B horizon is usually denser and more compact compared to the A horizon.
Roots of larger plants often extend into this layer for access to nutrients that have leached down.
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Related terms
A Horizon: The topsoil layer rich in organic material and microorganisms.
C Horizon: The soil layer beneath the B horizon consisting mostly of fragmented parent rock.
Leaching: The process by which soluble substances are washed out from soil or wastes.