The bacteria living freely in soil help the nitrogen fixation
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The free-living, or non-symbiotic, bacteria are made up of cyanobacteria, which most people know as blue-green algae. ... There are some soils where you don't find Azotobacter or Clostridium, however, sothese plants need to rely on the other group of bacteriafor nitrogen fixation: the mutualistic, or symbiotic,bacteria.
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