The production of nitric acid is very
closely linked to the manufacture of fertilisers, and this makes
it difficult to give accurate figures for the quantity produced.
Nitric acid plants are often sited alongside ammonia production
facilities. The nitric acid is then used directly to manufacture
fertiliser, without any transportation of nitric acid. Estimates
give the market in traded nitric acid as about 10% of the total
Nitric acid production is thus intimately involved with the production
and demand for nitrogenous fertiliser. As solid urea is increasingly
used as a nitrogenous fertiliser, rather than ammonium nitrate,
the growth in nitric acid production is now being restricted.