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Although nitrites are the nitrogen compound chiefly used in meat curing, nitrates are used in certain specialty curing processes where a long release of nitrite from parent nitrate stores is needed. The use of nitrates in food preservation is controversial.
Ammonium nitrate (AN) is an odorless, colorless or white, crystal salt produced by the reaction of ammonia and nitric acid. It was the first solid nitrogen (N) fertilizer produced on a large scale.ertilizer prills are formed as drops of the concentrated ammonium nitrate solution (95 to 99 percent) fall from a tower and solidify. Low-density prills are more porous and are preferred for industrial or explosive use.