- Ammonia, anhydrous and aqueous, manufacturing
- Ammonium nitrate manufacturing
- Ammonium sulfate manufacturing
- Anhydrous ammonia manufacturing
- Fertilizers, mixed, made in plants producing nitrogenous fertilizer materials
- Fertilizers, natural organic (except compost), manufacturing
- Fertilizers, of animal waste origin, manufacturing
- Fertilizers, of sewage origin, manufacturing
- Nitric acid manufacturing
- Nitrogenous fertilizer materials manufacturing
- Plant foods, mixed, made in plants producing nitrogenous fertilizer materials
- Urea manufacturing
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