Bacteria associated with plants fix very small amounts of nitrogen, therefore they do NOT contribute significantly to the global N cycle.

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Bacteria associated with plants, particularly those in the roots called rhizobia, are crucial for fixing atmospheric nitrogen into a form that plants can use. This process is important for the global nitrogen cycle, as it converts nitrogen gas (which is unreactive) into other nitrogen compounds that can be utilized by living organisms. However, while the amounts of nitrogen fixed by these bacteria may be relatively small on a global scale, they still play a significant role in supporting plant growth and ecosystem productivity.

Bacteria Associated with Plants Fix Very Small Amounts of Nitrogen