Based on the kind of biological material used, what are the two kinds of manures ? How are they prepared ?

Q. Based on the kind of biological material used, what are the two kinds of manures ? How are they prepared ? 
Ans. 1. Compost and vermicompost
2. Green manure
Compost and vermicompost: The process in which farm waste material, vegetable waste, animal refuse, domestic waste, sewage, straw, eradicated weeds etc. are decomposed in pits. It is rich in organic matter and nutrients. Compost is also prepared by using earthworms to hasten the process of decomposition of plant and animal refuse. This is vermicompost.
Green manure: Prior to the sowing of the crop seeds some plants like sunhemp or guar are grown and then mulched by ploughing. It helps in enriching the soil in nitrogen and phosphorus.

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