Nitrogen Fixation

**Definition:** The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.

**Tree numbers:** - G02.111.071.630 - G02.111.587.750 - G02.607.560.750 - G03.087.630 - G06.625 - G16.500.768.600

**Synonyms:** - Diazotrophic Activity - Dinitrogen Fixation - N2 Fixation