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What are biofertilizers ? Give two examp...

What are biofertilizers ? Give two examples.

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Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi and cyanobacteria.
E.g.: (i) Azospirillum, Rhizobium and Azotobacter can fix atmospheric nitrogen in the soil. (ii) BlueGreen Algae, Anabeana, Nostoc and etc are used as biofertilizer.
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