i) Biological (nitrogen) fixation, ii) Industrial / chemical (nitrogen) fixation // Haber process, iii) Natural (nitrogen) fixation/ lightning/ thunderstorm, To enrich nitrogen source in soil / enough supply of nitrogen, Nitrosomonas sp., Nitrobacter sp., Ammonia/ NH3// ammonium ion/ NH4+, Nitrate// Nitrate ion/ NO3-.

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