Deutsch: Stickstofffixierung / Español: Fijación de nitrógeno / Português: Fixação de nitrogênio / Français: Fixation de l'azote / Italiano: Fissazione dell'azoto /

A nitrogen fixation is the process in which Bacteria convert biologically unusable nitrogen gas (N2) into biologically usable ammonia (NH3) and Nitrates (NO3-).
Other /More definition:
A Nitrogen fixation is Conversion of atmospheric nitrogen gas into forms useful to plants and other organisms by lightning, bacteria, and blue-green algae; it is part of the nitrogen cycle.
Other /More definition:
Nitrogen fixation is the conversion of atmospheric nitrogen gas into forms useful to plants by lightning, bacteria, and cyanobacteria; it is part of the nitrogen cycle.