The Azimuth Project
Nitrification inhibitor

A nitrification inhibitor (also ‘nitrogen inhibitor’ and ‘NI’) is a chemical which slows or ‘inhibits’ the conversion of N from the relatively immobile ammonium (NH4) form to the mobile nitrate (NO3) form. Plants can use the ammonium, but as nitrate, nitrogen can be lost from soil as the gas nitrous oxide (N2O), which is a potent greenhouse gas, or be washed away in water. Nitrification inhibitors can be mixed into fertilisers. They form part of the strategy of Zero carbon Britain 2030.