Biofertillser is...

Biofertillser is

A

farm yard manure consisting of a mix- ture of cattle dung and crop residue

B

green manure in which quick growing crop is cultivated and plaughed unde the soil

C

a cyanobacteria like Anabaena spe?ies living in the cavities of Azolla species

D

symbiotic bacteria lik.e Azotobacter which fix atmospheric nitrogen

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