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Free Living Nitrogen Fixing Bacteri
Free living nitrogen fixing bacteria are those which are not intimately associated with a specific plant.

They include members of Klebsiella, Azotobacter, Clostridium, Rhodospirillum, Aspirillum and various cyanobacteria. Nitrogen fixation by free living bacteria in cultivated and is nitrogen fixing prokaryotes are divided into two groups, free living and Symbiotic nitrogen fixing bacteria.

In widespread, but the rate of nitrogen fixation is generally low. Non symbiotic nitrogen fixation in soils is limited by available energy.