BIO FERTILIZERS

Microbes As Biofertilizers
Free-living nitrogen-fixing bacteria like Azotobacter, and Rhodospirillum.
Free-living nitrogen-fixing Cyanobacteria like Anabaena, and Nostoc.
Loose association of nitrogen-fixing bacteria like Azospirillum.
Symbiotic nitrogen-fixing bacteria like Rhizobium, and Frankia.

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