Fertilizer dispensers are simple devices for sucking liquid fertilizers in irrigation systems. The pressure in the flowing liquid is inversely proportional to the speed of the liquid flow and in the narrowed part of the tube the liquid has a lower pressure. If a suction hose is connected, then the liquid fertilizer is sucked in. The disadvantage of this device is the impossibility of influencing the concentration of the fertilizer and the large pressure loss in the device.
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