Definicija: The removal of water or any soluble constituents from the soil. Leaching often occurs with soil constituents such as nitrate fertilizers with the result that nitrates end up in potable waters.

Definicija: Odstranjevanje vode ali drugih topnih sestavin iz prsti. Pogosto je izpiranje sestavnih delov prsti, kot so dušikova gnojila, posledica so nitrati v pitni vodi.