Method (experimental setup) In this study, the main components of fertilizer mixing system (Figure 3) are a control circuitry (including timer and adjustable motor pump), solenoid valve, water lever and mixing tank has been designed, developed and installed. Initially, the water level was set to the lower and upper limit in the mixing tank to indicate the volume of water inlet of the mixing process. The water level sensor was connecting to the main 24 volt dc power supply and in the same time it would act as a switch for control circuitry and the water solenoid valve. The mixing solution is prepared in a cylindrical polyethylene tank (N40, 270l/60gal) and the stock of fertilizers were placed in two separate 100l tanks. The fertilizer injectors used are motor pump with a flow rate of maximum 60 ml/s.