导数装置

Result 2TYB-450 rice seedling seeder adopted the synchronous driving wheel, the equipment for vibrating and homogeneous sowing and the guiding sowing plate with seed box cross, so it didn't slip when driving and had high eligible ratio of sowing, good effect of filling seeds, less sowing seed number per seedling area and high working stability, with the sowing eligible ratio of 68.67%, the sowing blank-hole ratio of 1.89% and the sowing seed number per seedling area of 4.19. The working performance of 2FBS-840 seeder was next and that of MR-BZ840A seeder was worst.

结果］2TYB-450型播种机采用同步驱动轮、振动匀种装置、种箱交叉导种板，驱动不滑移，播种合格率高，充种效果好，每取秧面积播种粒数少，工作稳定性高，其播种合格率为68.67%，空格率为1.89%，每取秧面积播种粒数4.19；2FBS-840型播种机的作业性能次之，MR-BZ840A型播种机的最差。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。