Nitrification In this process, the ammonia is converted into nitrate by the presence of bacteria in the soil. Nitrites are formed by the oxidation of ammonia with the help of Nitrosomonas bacteria species. Later, the produced nitrites are converted into nitrates by Nitrobacter. This conversion is very important as ammonia gas is toxic for plants. The reaction involved in the process of Nitrification is as follows: 2NH3 3O2 → 2NO2– 2H 2H2O 2NO2– O2 → 2NO3– | Mtishtech international