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Cyanobacteria like Nostoc and Anabaena are free-living nitrogen-fixing organisms that enhance soil fertility.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biofertilizers - Rhizobium Azospirillum Mycorrhiza Cyanobacteria
Rhizobium is a symbiotic nitrogen-fixing bacterium found in root nodules of leguminous plants.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biofertilizers - Rhizobium Azospirillum Mycorrhiza Cyanobacteria
Rhizobium forms root nodules in legumes and fixes atmospheric nitrogen, improving soil fertility.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biofertilizers - Rhizobium Azospirillum Mycorrhiza Cyanobacteria
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