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Which of the following manure is considered as bio-fertilizer?
Question

Which of the following manure is considered as bio-fertilizer?

A.

Farm yard manure

B.

Compost

C.

Green manure

D.

Blue green algae

Correct option is D

✅ (d) Blue green algae: • Blue green algae (BGA) like Anabaena and Nostoc fix atmospheric nitrogen in paddy fields. • They are considered bio-fertilizers, unlike organic manures like FYM or compost.

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