Karanjin, a furanoflavonol, a type of flavonoid. It is obtained from the seeds of the karanja tree (Millettia pinnata, aka Pongamia glabra Vent.), a tree growing wild in south India. Karanjin is an acaricide and insecticide. Acaricide means a product that is used to kill mites (Acarina). Karanjin is used as bio pesticide / bio insecticide and is reported to have nitrification

Nitrification

Nitrification is the biological oxidation of ammonia with oxygen into nitrite followed by the oxidation of these nitrites into nitrates. Degradation of ammonia to nitrite is usually the rate limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil...

 inhibitory properties.