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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.
The combination form, also called UAN, is a uniform, dry product of ammonium nitrate and urea. Its nitrogen content ranges from about 28 to 32 percent.When used alone, ammonium nitrate contains about 34 percent nitrogen. Both the single and combination forms are easily soluble in water and more readily available for plant uptake than urea alone.he combination form, also called UAN, is a uniform, dry product of ammonium nitrate and urea. Its nitrogen content ranges from about 28 to 32 percent.