Nitrification of ammonia occurs when ammonia is first converted to nitrite and then is converted to nitrate by the nitrogen-fixing bacteria.

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Nitrification of ammonia occurs when ammonia is first converted to nitrite by Nitrosomonas bacteria and then nitrite is converted to nitrate by Nitrobacter bacteria. Both Nitrosomonas and Nitrobacter bacteria are involved in nitrification, not nitrogen-fixing bacteria.

Nitrification of Ammonia Occurs When Ammonia Is First Converted to Nitrite