Based on the magnetic seed-metering principle, a new magnetic plate-type precision seeder and seeding productionline were developed to meet the requirements of precision seeding. The control system was designed based onProgrammable Logic Controller (PLC) and Mico Controller Unit (MCU). Automatic programming techniques, sensortechnology, acceleration and deceleration control of step motor were integrated into the system. The PLC control systemcontrols the workflow of the production line to realize accurate positioning of the tray and its coordination. The MCUcontrol system controls the flip of the sowing board, as well as the up-and-down movement of the seed case for whole trayseed-filling and sowing. Seeding tests for the magnetic powder coated rape seeds showed that the rates of single-seeding,over-seeding and miss-seeding were 90.2778%, 4.6875% and 5.0347% respectively. The seeding speed was up to 14s pertray. This result meets the requirements of precision seeding.
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