Abstract: In order to improve the accuracy of mechanical seeding device, a slider-hole-wheel hybrid rice precision seeding device was designed according to the agronomic requirements, and its basic structure and working principle were described. The primary parts, such as seeding wheel, guard slider, and flange, were designed and analyzed. Three hybrid rice varieties with varied seed sizes, i.e. Guofeng No.1, Gangyou898 and Gangyou3551, were selected as the experimental materials. The qualified rate, the replay rate and the missing rate were taken as the evaluation indexes of seeding performance. It was shown that when the rotation speed of seeding axis was 30 r·min^-1, the seed metering performance of medium-sized seed (Gangyou898) was the best, as the qualified rate was 83.24%, the replay rate was 10.48%, and the missing rate was 6.28%; the seed metering performance of large-sized seed (Guofeng No.1) was the second, as the qualified rate was 81.84%, the replay rate was 10.27%, and the missing rate was 7.89%; the seed metering performance of small-sized seed (Gangyou3551) was the third, as the qualified rate was 80.14%, the replay rate was 15.16%, and the missing rate was 4.70%. These results demonstrated that the proposed slider-hole-wheel seeding device had good adaptability to different rice seed sizes, and its seeding performance could meet the agronomic requirements of hill-direct-seeding for hybrid rice.

Key words: hybrid rice, slider, seeding wheel, precision hill-direct-seeding