Design and Development Control System for Deep-Fertilization Variable Liquid Fertilizer Applicator

In order to improve Liquid fertilizer efficiency, Liquid variable fertilizing control system was designed with two working modes: a manual control and an automatic control mode. Taking the S3C44B0X microprocessor of ARM7 series as the core device, according to the fertilizing amount of the current location, the system was able to combined together for the machine speed and access to data, and the fertilizing amount from digital quantity to the flow of Liquid output was transformed. Flow Sensor was taken, a closed-loop feedback regulation to control the opening of electrical actuators was formed, adjusted valve opening to compete the variable fertilization. The test results in the field showed that the relative error of the variable fertilizing amount was less than 5%, When the fertilizing amount was 245-294kg/hm², the system can realize the requirements of variable fertilizing.