Living organisms need nitrogen to form nucleic acids, proteins, and other molecules. However, the nitrogen gas, N2, in the atmosphere is unavailable for use by most organisms because of the difficulty breaking the triple bond between nitrogen atoms. Nitrogen has to be 'fixed' or bound into another form for animals and plants to use it. Here is a look at what fixed nitrogen is and an explanation of different fixation processes.
Fixed nitrogen is nitrogen gas, N2, that has been converted to ammonia (NH3, an ammonium ion (NH4, nitrate (NO3, or another nitrogen oxide so that it can be used as a nutrient by living organisms. Nitrogen fixation is a key component of the nitrogen cycle.
http://chemistry.about.com/od/nitrogen/f/What-Is-Fixed-Nitrogen-Or-Nitrogen-Fixation.htm - Patricia Basconcillo
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