OBJECTIVE FORESTRY

Detailed explanation-1: -A horizon or topsoil – This layer is known as a humus layer and is mainly rich in organic materials. It consists of both organic matter and other decomposed materials.

Detailed explanation-2: -The uppermost layer of the soil is called topsoil and this layer contains humus, plant roots, and living creatures. The more humus found in topsoil, the more nutrient rich the topsoil and the better the conditions for growing plants.

Detailed explanation-3: -Humus is the dead and decaying bits of animals and plants present in the topmost layer of soil.

Detailed explanation-4: -The layers of the soil are called horizons. The uppermost horizon is called the topsoil layer. The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus.

Detailed explanation-5: -’A’ horizon is the topmost layer of soil profile. The maximum content of humus is found in this layer. The humus content decreases as we move deeper. This is because most of the living organisms live in the topmost layer of soil i.e. ‘A’ horizon.