Design and experiment of intelligent monitoring system for vegetable fertilizing and sowing

Vegetable production is facing the problems of low resource utilization rate and serious environmental pollution. Vegetable sowing and planting with fertilizer have the characteristics of extensive and low efficiency. An intelligent monitoring system of vegetable fertilization and seeding is designed in this paper. The system uses CAN bus communication protocol to collect sensor signals and PLC to control the execution part. The seeding and fertilization monitoring were carried out by photoelectric sensing technology and piezoelectric thin film technology, respectively. The system is composed of sowing and fertilizing machinery, monitoring system of seed leakage, alarm system of fertilizer blockage, variable-rate fertilization control system and on-board computer. The system uses the GPS module to get the location information of the machine. Combined with the pre-loaded plots map of soil prescription, the target fertilization amount in the current position is determined. Pressure sensor and microcomputer control are used to calculate the current fertilization rate and flow information, and the fertilization rate is adjusted in real time according to the moving speed of the machine. Finally, the detection of miss-seeding, blocking and precision fertilization is realized. The field test results show that the accuracy of monitoring is over 91%. The alarm error of fertilizer blockage is less than 4%. The accuracy of variable fertilization is more than 94%. The whole machine monitoring system can adapt to complex field environment and has better practicability and economy.