Plastic fertilizer ozone venturi injector for drip irrigation Venturi fertilizer injector Control valve installed in parallel tube Venturi injector and micro irrigation system or irrigation area at the entrance of the water supply, when the control valve is small, the control valve before and after a certain pressure, the water flow the venturi injector, siphon tube will suck the fertilizer. You can control the flux by angle of the valve. Venturi fertilizer injectors can save fertilizer more than 50 %. Venturi fertilizer injectors saves both time and labour. It can reduce damage to the roots of crops.