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Nitrogen fixing
Nitrogen -> Ammonia -> Ammonium ions = N2 -> NH3 -> NH4+
Nitrifying bacteria
Ammonia -> Nitrites -> Nitrates = NH3 -> NO2- -> NO3-
Denitrifying bacteria
Nitrates -> Nitrogen = NO3- -> N2
Decomposers
Nitrogen -> Ammonium ions = N2 -> NH4+