Nitrogen fixing bacteria fix the atmospheric nitrogen which is available in gaseous form and convert them to nitrates, nitrites and ammonia which can be utilized by the plants.these bacteria are called di-azotrophs and they contain an enzyme called nitrogenase which is essential for biological nitrogen fixation.
On the other hand nitrifying bacteria obtain energy through oxidation of inorganic nitrogen compounds.They can be defined as chemilithotrophs
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Nitrogen fixing bacteria fix the atmospheric nitrogen which is available in gaseous form and convert them to nitrates, nitrites and ammonia which can be utilized by the plants.these bacteria are called di-azotrophs and they contain an enzyme called nitrogenase which is essential for biological nitrogen fixation.
On the other hand nitrifying bacteria obtain energy through oxidation of inorganic nitrogen compounds.They can be defined as chemilithotrophs