OBJECTIVE FORESTRY

Detailed explanation-1: -The determination of soil organic carbon is based on the Walkley-Black chromic acid wet oxidation method. Oxidisable matter in the soil is oxidised by 1 N K2Cr2O7 solution. The reaction is assisted by the heat generated when two volumes of H2SO4 are mixed with one volume of the dichromate.

Detailed explanation-2: -CHEMICAL: Soil organic matter significantly improves the soil’s capacity to store and supply essential nutrients (such as nitrogen, phosphorus, potassium, calcium and magnesium), and to retain toxic elements. It allows the soil to cope with changes in soil acidity, and helps soil minerals to decompose faster.

Detailed explanation-3: -Soil heating directly affects microorganisms by either killing them directly or altering their reproductive capabilities. Indirectly, soil heating alters OM (energy source) and increases nutrient availability, thereby affecting subsequent microbial growth.

Detailed explanation-4: -Take a glass beaker add some soil in it, then pour some water on the soil slowly, the air-bubbled comes out of the soil. This proves that soil holds air in it.