@ RK, humus is nothing but dark organic materials present in soil after the decomposition of plant and animal residues by microorganisms. Microorganisms has a great role in waste disposal and composting. Generally, they decompose organic waste materials including organic pollutants . They are also very active in compost pit and responsible for organic matter breakdown as chemical decomposers as they use chemicals in their bodies to breakdown organic matter.

Dr J.C. Tarafdar thank you for your contribution to the discussion