Development and Performance Test of Auto-Control Fertilization Equipment

【Objective】 Development and Performance Test of Auto-Control Fertilization Equipment.In this paper, an automatic fertilization system of fertigation for solid soluble fertilizer was developed and its performance was tested. 【Methods】 The system was composed of the mainframe and fertilizer storage mixing assembly. ARM9 circuit control module was used to complete the setting of rotational irrigation grouping, premixing time, beginning and end time of fertilization, duration of fertilization, and fertilizer amount. It was equipped with a screw pump as fertilizer injection device, a transducer control regulating the motor power of fertilizer injection pump, and then the amount of fertilizer application was controlled. This paper mainly designed and tested the main parameters that would affect the performance of the device, such as the measurement method, the mixing parameters of dissolved fertilizer, the discharging speed of fertilizer and the ratio of liquid to solid. 【Results】 The results showed that among the three alternative metering methods (timing metering, flowmeter metering and pulse metering), the standard error of inductive pulse metering method was the lowest, which was ±0.83L/50L, and met the control requirements of error design. Therefore, it was determined as the metering method adopted by this device. By the stirring system with 38 r/min, the concentration of fertilizer solution with 1.1-1.3 g/mL, and the premixing time with 30 min, there was no significant difference (P < 0.05) of the concentration of fertilizer solution at each liquid level in the tank. 【Conclusion】 Therefore, the machine designed in this paper can greatly improve the automation level for fertigation and reduce the labor intensity of fertilization in field crop. It has broad applicability and popularity in our facility crop production.