BOTANY

Detailed explanation-1: -Compared to other layers of a typical soil profile, the amount of organic matter in the A horizon is: More. Most row crops grow best in a pH ranging from: 5.5 to 6.5.

Detailed explanation-2: -The topmost horizon is the ‘A’ horizon and, as we have noted above, is usually the darkest layer of the soil because it contains most of the organic matter. Here, remnants of plants and even animals are incorporated into the soil.

Detailed explanation-3: -The topsoil is usually the darkest layer of the soil. It is the layer with the most organic material. Humus forms from all the plant and animal debris that falls to or grows on the ground. The topsoil is also the region with the most biological activity.

Detailed explanation-4: -Called the A horizon, the topsoil is usually the darkest layer of the soil because it has the highest proportion of organic material.

Detailed explanation-5: -The topsoil has the highest concentration of organic matter, nutrients and is where most of the soil’s biological activity occurs. Soil that is not protected by residue or living cover is subject to erosion.