Skip to main content

Search from vocabulary

Content language

Concept information

Preferred term

nitrogen fixation  


  • [Henderson's] the process whereby atmospheric elemental nitrogen (dinitro­gen, N2) is reduced to ammonia (NH3), and which is carried out in the living world only by some free-living bacteria and cyanobacteria and by a few groups of bac­teria in symbiotic association with plants (the Rhizobium–legume association and the actinomycete–non-legume associations). The reaction is catalysed by the enzyme nitrogenase. Biological nitrogen fixation is the chief process by which atmospheric nitrogen enters the biosphere and becomes available as a nutrient to other organisms, although industrial nitrogen fixation is now of considerable significance. A smaller amount of atmospheric nitrogen is also fixed by conversion into nitrogen oxides by the action of lightning. see also nitrogen cycle.

Broader concept

Entry terms

  • N2 fixation


  • [controlled by ] Staszewski 08.06.2013

Scope note

  • US LTER controlled vocabulary



In other languages


Download this concept:

RDF/XML TURTLE JSON-LD Created 3/31/16, last modified 12/18/18