Bacteria enrich the soil with various nutrients such as Nitrogen, Phosphorous and improve the quality and texture of the soil.
For example:
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Rhizobium, a symbiotic bacterium lives in the root nodules of leguminous plants and converts atmospheric nitrogen into organic compounds.
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Azotobacter and Azospirillum are free-living bacteria which absorb free nitrogen present in soil, air and convert them into amino acids and enrich the soil.
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Blue Green Algae such as Anabaena, Nostoc add organic matter to the soil and enrich it.
