Answer:
Biofertilisers are organisms that enrich
the nutrient quality of the soil. The main source of biofertilizers are
bacteria, fungi and cyan bacteria .e.g.,
(i) Azospirillum, Rhizobium and
flzotobacter can fix atmospheric nitrogen in the soil.
(ii) Blue-green algae like Anabaena,
Nostoc. Occilatoria add organic matter to the soil and responsible for increase
its fertility
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