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- Manufacture of nitric acid, ammonia, commercial ammonium chloride, nitrates of potassium and other basic chemicals of nitrogenous fertilizer industry (10)
- Manufacture of others fertilizers n.e.c. ( manufacture of pesticides are classified in class 2421) (7)
- Manufacture of urea and other organic fertilizers (2)
- Manufacture of mixed, compound or complex fertilizers (1)