Abstract:According to the existing problems of no/minimumtill wheat seeding in maize straw covered field in doublecropping system area in the NorthChina Plain, such as residue blockage, low cleanness of seedbed, a strip tillage interrow residue sidethrowing device for antiblocking and seedbedcleaning was developed. The blade tilt angle, tilt line angle and rotary radius were identified as the key parameters influencing seedbed cleaning in the straw throwing process during seeding operation. Through BoxBehnken central composite rotatable design experiment conducted by discrete element method (DEM) simulation, the optimal parameter of blade tilt angle was 25°, and tilt line angle was 30°, rotary radius was 250mm, when torque requirement was 47.2N·m, seedbed cleaning index was 80.5%, and soil throwing index was 15.8%. An seeding and fertilizing opener was designed with a fixed blade in the front which could coordinate with the rotating blade to recut residues for antiblocking; a Vtype board for soil guidance was designed with the angle of 130° which could rebound soil return to seedbed; and an antitwinning board was designed which could increase rotor radius for antiresidue twinning. Field experiments showed that the seedbedcleaning and antiblocking device had a good antiblocking performance, its seedbed cleaning rate was 82.7%, and torque requirement was 2982N·m. The seeding and fertilizing quality satisfied the national and standard agronomy requirement.