Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?

Which of the following materials of biological origin are commonly use

1.	Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?
A.	Green manure
B.	Biofertilisers
C.	Bioinsecticides
D.	Both [a] and [b]
Answer» E.

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Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?

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