1- Fertilizer injection pumps
The simplest means for injecting fertilizer are piston or diaphragm pumps. These pumps work with electricity or gasoline and receive fertilizer from a tank and pressurize it into the irrigation pipe.
In small irrigation projects, the use of venturi is the simplest device. Venturi is installed in the irrigation pipe. Water velocity in the section
When it is narrow, it increases and the water pressure decreases. This decrease in pressure causes the fertilizer to have a higher pressure in its tank
It is sucked into the pipe and mixed with water and enters the system. This device does not use electricity or other energies
Compared with other methods of injecting fertilizers and poisons into plants, it has a much lower cost and with high efficiency and completely uniform concentration, fertilizer solution
directs into the system.
3-pressure difference tanks:
Fertilizer spraying with a pressure difference tank is used when the exact concentration of fertilizer inside the system is not desired. For this purpose, a pressure reducing device such as a pressure relief valve is installed inside the irrigation pipe, so a pressure difference is created on both sides. So that the pressure upstream of the valve will be high and downstream of it will be lower, as a result, the water from the upstream part, which has a higher pressure, enters the lower part of the fertilizer tank and through the hose installed on top of the solution fertilizer tank, it will go downstream of the pressure valve. The breaker enters and enters the system along with the water flow. With this method, solid fertilizers can also be introduced into the tank so that the water gradually dissolves it and then enters the system.