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All organisms use the ammonia (NH3) form of nitrogen to manufacture amino acids, proteins, nucleic acids, and other nitrogen-containing components necessary for life. Biological nitrogen fixation is the process that changes inert N2 to biologically useful NH3.
Because of the greater amount of proteins required by land species, Nitrogen is usually the element which will limit the vigour of their communities. The Nitrogen Cycle Step 1: Nitrogen-Fixation Refers to the conversion of atmospheric nitrogen, which is extremely inert, into water soluble forms that can be used by living things. Atmospheric: Happens when Nitrogen (N2) is oxidized at high temperatures (by lightning, in internal combustion engines) to make nitrite (NO2).