Abstract: In order to meet the requirements of planting techniques of dry-land corn with whole plastic-film mulching on double ridges in northwest China, to solve the problems about picked film, tore film and dislocation of soil hole caused by the traditional film seeding machine, a self-propelled direct insert precision hill-seeder of corn with whole plastic-film mulching on double ridges has been developed, which provided the theoretical basis for the development of agricultural machinery equipment about high-performance direct insert seeding on plastic-film. According to the direct insert planting operation principle, the prototype structure, transmission scheme and key parts of the hill-seeder were analyzed. With the help of a Step function to establish motion studies, the profile of disc cam and the corresponding seeding kinematic trajectory were studied, and the seeding experiment in the field was carried out. The motion amplification mechanism and direct insert planting device have been designed, the maximum size of disc cam was 182.719 mm and the minimum radius of curvature was 53.057 mm, and the corresponding Step function was obtained. After the self-propelled direct insert precision hill-seeder worked, the dislocation of soil hole rate was 0.43% and the mechanical damage of daylighting plastic was 45.5 mm·m^-2. The sowing motion trajectory of self-propelled direct insert precision hill-seeder was reasonable, the direct insert planting device horizontal velocity component was zero in sowing period and excavating period, which could realize the self-adaption and low damage planting with whole plastic-film mulching on double ridges, to meet the technical requirements specification of planting operation quality on plastic-film.

Key words: whole plastic-film mulching on double ridges, corn, direct insert, hill-seeder