Nitrification /(?)/

Ni·tri·fi·ca·tion

Nitrification

n.
  1. The act, process, or result of combining with nitrogen or some of its compounds. (Chem.)
  2. A process of oxidation, in which nitrogenous vegetable and animal matter in the presence of air, moisture, and some basic substances, as lime or alkali carbonate, is converted into nitrates.