What is meant by nitrogenfixation?

Answer 1

Nitrogen fixation is one process by which molecular nitrogen is reduced to form ammonia. This complex process is carried out by nitrogen-fixing bacteria present in the soil. Although nitrogen-fixation involves a number of oxidation-reduction reactions that occur sequentially, that reaction which describes its reduction can be written in a simplified way as:

N2 + 6e- + 8H+ ---> 2 NH4+ (ammonium ion)