nitrification ni·tri·fi·ca·tion (nī'trə-fĭ-kā'shən)
The oxidation of an ammonia compound into nitric acid, nitrous acid, or any nitrate or nitrite, especially by the action of bacteria.
The treatment or combination of a substance with nitrogen or compounds containing nitrogen.
The process by which bacteria in soil and water oxidize ammonia and ammonium ions and form nitrites and nitrates. Because the nitrates can be absorbed by more complex organisms, as by the roots of green plants, nitrification is an important step in the nitrogen cycle.