NURSING ANM AND GNM

Detailed explanation-1: -The addition of organic matter to the soil usually increases the water holding capacity of the soil. This is because the addition of organic matter increases the number of micropores and macropores in the soil either by “gluing” soil particles together or by creating favourable living conditions for soil organisms.

Detailed explanation-2: -In general, organic binding agents can significantly improve the water-stability of aggregates compared to inorganic binding agents [12]. Thus, these organic binding agents play important roles in resistance to soil erosion [13]. Stable aggregates provide a physical protection for SOM to reduce microbial attack [11].

Detailed explanation-3: -The increase in organic carbon in soil has a small effect on soil water retention. A 1% mass increase in soil OC on average increased available water capacity by 1.16%, volumetrically.

Detailed explanation-4: -The chief factors involved are particle size, wetting and drying, freezing and thawing and other temperature changes, cultivation, plant growth, and possibly microorganisms and earthworms.