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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.
Nitrogen form Plants have the ability to take up several chemical forms of nitrogen. The most common are: ammonium (NH 4+), which has a positive charge; nitrate (NO 3-), which has a negative charge; and urea, ((NH 2)2CO), which has no charge.any commercial fertilizer mixes contain a combination of all three nitrogen forms. When these nitrogen forms are added to the growing medium natural processes can take place that convert one form to another (Figure 1). Bacteria can convert urea to ammonium or ammonium to nitrate.