OBJECTIVE FORESTRY

Detailed explanation-1: -The middle layer is called the B horizon or the zone of accumulation. The leached materials from the A horizon often precipitate in this more clay‐rich zone that is reddish‐brown from iron minerals. This horizon is also called the subsoil. The combined O‐A‐B section is sometimes called the solum.

Detailed explanation-2: -Subsoil is the layer of soil under the topsoil on the surface of the ground. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus, and it has a small amount of rocks which are smaller mixed with it.