B horizon

Definition

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.

5 Must Know Facts For Your Next Test

1. The B horizon is also known as the subsoil.
2. It typically contains less organic material than the A horizon but more mineral deposits.
3. Clay, iron, and aluminum oxides are commonly accumulated in this layer due to leaching from upper layers.
4. The texture of the B horizon is usually denser and more compact compared to the A horizon.
5. Roots of larger plants often extend into this layer for access to nutrients that have leached down.

Review Questions

• What materials are commonly found accumulated in the B horizon?
• Why is the B horizon denser than the A horizon?
• How does the nutrient content of the B horizon compare to that of the A horizon?

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.