Question

what is the use ofpreparing manure from the waste

Answer 1

i can give two reasons 
firstly : the waste that is converted into manure reduces the amount of waste from household that rag pickers have to separate.
secondly :the manure is highly nutritious for the plants and it increase their capacity to produce more fruits and vegetable .

Answer 2

Manure is prepared from organic waste which decomposes fast in soil which increases fertility in the soil and makes the soil comfortable for the plant to yield the crop