Definitions:

1. A subsurface soil layer that is immediately beneath the A-horizon from which it obtains organic matter chiefly by alluviation and is usually distinguished by less weathering. NOUN
   • In arid and semi-arid regions, calcium carbonate or calcium sulfate may accumulate in the B-horizon.
2. Also known as a subsoil, is a soil layer that lies immediately beneath the A-horizon in a soil profile. NOUN
   • The B-horizon is yellow-brown.
3. Soil layer that plays a crucial role in soil development and nutrient cycling, contributing to the overall health and fertility of the soil. NOUN
   • Farmers often analyze the B-horizon to understand soil drainage and nutrient availability.

Synonyms:

• mineral horizon
• soil horizon
• subsoil