section_path: Production/Nitrogen fertilizers
section_name: Nitrogen fertilizers
paragraph_text: Nitrogen fertilizers
  
  Nitrogen fertilizers are made from ammonia (NH) produced by the Haber–Bosch process. In this energy-intensive process, natural gas (CH) usually supplies the hydrogen, and the nitrogen (N) is derived from the air. This ammonia is used as a feedstock for all other nitrogen fertilizers, such as anhydrous ammonium nitrate (NH NO) and urea (CO(NH)).
  
  Deposits of sodium nitrate (NaNO) (Chilean saltpeter) are also found in the Atacama desert in Chile and was one of the original (1830) nitrogen-rich fertilizers used. It is still mined for fertilizer. Nitrates are also produced from ammonia by the Ostwald process.