Nitrogen fixing bacteria living in legume root nodules, Nitrogen fixing bacteria living in the soil, Nitrifying bacteria converts ammonium (NH4 ) into usable forms like nitrates (NO2, Bacteria convert nitrites (NO2) into nitrate (NO3), Nitrates are used by the plants to make plant proteins, Nitrogen fixing bacteria convert atmospheric nitrogen (N2) to ammonium (NH4), Denitrifying bacteria convert nitrates (NO3) into atmospheric nitrogen (N2)).

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