Answer 1

1. The regular use of organic manures, vermicompost, compost helps in maintaining the pH balance in the soil.
2. A large number of microorganisms exist in the soil with high pH.
3. Micro-organisms decompose the dead remains of the plants and animals and other organic materials. the biotic material thus produced is called humus. Thus, by regular use of organic manures, humus content in the soil increases.