OBJECTIVE FORESTRY

Detailed explanation-1: -Some experts think humus makes soil more fertile. Others say humus helps prevent disease in plants and food crops. When humus is in soil, the soil will crumble. Air and water move easily through the loose soil, and oxygen can reach the roots of plants.

Detailed explanation-2: -Humus contains many nutrient minerals that improves the health and fertility of the soil. Carbon is critical for healthy soil conditions, and humus is roughly 60 percent carbon. There are six additional essential nutrients that plants need in their soil: phosphorus, potassium, magnesium, sulfur, calcium, and nitrogen.

Detailed explanation-3: -Soil rich in humus has high fertility. Soil low in humus has low fertility. Soil that is made up of equal parts of clay, sand and silt. It has a crumbly texture that holds both air and water.

Detailed explanation-4: -Fertile soil has a high concentration of humus because it contains microbes that decompose dead organic matter in the soil and humus formation takes place. Humus is a mineral source that absorbs H2O and allows plant roots to pass through the soil. Humus is necessary for the binding of soil particles into crumbs.