The common reasons why the quality Venturi Injector products do not suck fertilizer are as follows.
1. The installation process of the fertilizer applicator is incorrect. For example, if the direction of the water inlet and outlet of the fertilizer applicator is reversed, the fertilizer suction port will become smaller, which will cause the quality Venturi Injector products to not absorb fertilizer. Therefore, the Venturi fertilizer applicator must be installed in strict accordance with the correct installation method.

2. The quality Venturi Injector products need a certain amount of pressure during fertilization before it can start working. When the pressure is insufficient, even adjusting the pressure regulating valve cannot achieve the effect of sucking fertilizer.
3. When the irrigation area is small and the capillary water output in the field is small, the quality Venturi Injector will fertilize normally when it is just opened. However, as the pressure in the capillary continues to increase, the pressure difference between the front and rear of the quality Venturi Injector products applicator is smaller than the pressure that generates negative pressure, resulting in the inability to carry out normal fertilizer suction.
4. There is a blockage in the throat of the quality Venturi Injector products, which is similar to the fact that foreign objects in people's throats will affect people's vocalization. The blockage in the throat of the Venturi is also the reason why the Venturi fertilizer applicator does not suck fertilizer.