$(x) A biofertilizer is :
(a) Farmyard manure consisting of mixture of cattle dung and crop residues
(b) Green manure in which a quick growing crop is cultivated and ploughed under
Va A cyanobacterium like Anabaena sp. living in cavities of Azolla leaves.
(d) Symbiotic bacteria like Azotobacter which fix atmospheric nitrogen.
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Explanation:
a) Farmyard manure consisting of mixture of cattle dung and crop residues
Answered by
1
Answer:
a.farmyard manure consisting of mixture of cattle dung and crop residues
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