Nitrogen fixation

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nitrogen fixation

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Definition

Glossary of "Life (9th ed.)" by Sadava et al. (2011)

  • Conversion of atmospheric nitrogen gas (N2) into a more reactive and biologically useful form (ammonia), which makes nitrogen available to living things. Carried out by nitrogen-fixing bacteria, some of them free-living and others living within plant roots.

Glossary of "Environmental Science: Earth as a Living Planet (2nd ed.)" by Botkin & Keller (1998)

  • The process by which atmospheric nitrogen is converted to ammonia, nitrate ion, or amino acids. Microorganisms perform most of the conversion but a small amount is also converted by lightning.

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