Question

3 different means by which atmospheric nitrogen is fixed into soil?

Answer 1

• Atmospheric nitrogen fixation takes place by the following processes:
  
• Lightning converts atmospheric nitrogen into ammonia and nitrate that enter into the soil with rainfall.
• Industrial fixation i.e., under great pressure and at a temperature of 600 degree Celsius, with the use of a catalyst, atmospheric nitrogen and hydrogen are combined to form ammonia which can further be used as fertilizer.
• Biological fixation i.e., nitrogen gas diffused with soil from the atmosphere and some species of bacteria converts it into ammonium ions that can further be used by plants. Legumes (grown by farmers) also play an important role here as they have nodules on their roots which have nitrogen-fixing bacteria.