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Biofertilisers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilisers are bacteria, fungi and cyanobacteria.
Azospirillum, Azotobacter and Rhizobium are capable of fixing atmospheric nitrogen into organic forms, which are used by plants as a nutrient. Hence they are known as nitrogen fixing bacteria.
Rhizobium is a symbiotic nitrogen fixing bacterium. It is associated with the roots of leguminous plants. Azotobacter and Azospirillum, on the other hand, are free-living nitrogen fixers and help in enriching the nitrogen content of the soil.
Glomus is a fungus which forms symbiotic associations with the roots of higher plants. The association is known as mycorrhiza.The fungal symbiont in such associations helps the plants in absorbing phosphorus from soil. Plants having such associations show several other benefits, such as resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development.