Liquid ammonia as nitrogenous fertiliser is ideal, since it prevents wash-out. It is immediately transformed into non-volatile ammonium nitrogen upon contact with moist soil. Because ammonia is a base, it will indirectly inhibit the bacteria, which convert the ammonium to nitrate nitrogen, meaning that it will take longer for bacteria to transform the ammonium nitrogen into nitrate nitrogen, which can be washed out to the soil.
Ammonia is washed out to the soil with a special machine, injecting ammonia 10-15cm deep and the fertiliser works instantly, just where the root network starts.