Abstract: The present invention is of an apparatus for providing a precalculated amount of fertilizer to a fertigation system. The system features a fertilizer tank for storing a fertilizer, at least one counter for providing electric pulses associated with an amount of fertilizer expelled out of the tank, a pump for delivering an amount of the fertilizer out of the tank and a controller for commanding the pump to expel the fertilizer out of the tank. The apparatus includes at least one measurement device for measuring a volume of fertilizer in the tank and an electronic liquid control unit in communication with the measurement device. The electronic liquid control unit is configured to communicate with the counter and is further configured to communicate with the controller to actuate the pump for delivering a precise amount of fertilizer according to an output of the electronic liquid control unit.