A Practical Study on development of a seeding machine with correct seeding depth for direct seeding with coated rice in submerged paddy field.

研制了一种新型水稻覆膜直播机。该播种机是为提高和稳定水稻深松播种的成苗率而研制的。该播种机的播种深度不受土壤质地和土壤硬度的影响，播种深度可达1cm左右，并能在稀土稻田中立即播种。本研究将旧播种机的排种机构应用于新型播种机。试验设计了一种水稻覆膜直播机，取消了原有播种机的基本部件开沟器。介绍了一种新研制的排种轮。在水田中利用播种轮播种包衣水稻，在水田较稀的情况下，土壤从漂浮物底部上升到漂浮物顶部，包衣水稻沿着停留在漂浮物上的导种器落下。结果，它们没有被播种轮播种到稻田中，而是被带到稻田表面。为了解决这些问题，在浮子和导种器上增加了一些新的机构，并在土槽和水田上进行了三年的试验。研制的新型播种机能在较薄的稻田中稳定播种包衣水稻，其研究成果可望得到很好的应用，推广DSSP栽培，降低水稻生产成本。

Development of a new seeding machine for DSSP (direct seeding with coated rice in submerged paddy field) has been completed. This seeding machine is developed for improvement and stabilization of percentage establishment for DSSP. And it has the correct seeding depth that are not under the influence of soil texture and soil hardness.The followings were especially considered for the design of it.1.Nearly 1 cm seeding depth.2.Ability of seeding in the week paddy field immediately after puddling.In this study, a seed feeding mechanism of the old seeding machine was applied to the new seeding machine. Only direct seeding mechanism which seeded the coated seed rice in paddy soil was manufactured as an experiment.A ditcher, it is a basic element of the old seeding machine, was did away with. A seeding wheel was developed newly. Coated rice were seeded in submerged paddy field by the seeding wheel.In the case of week paddy field, the soil rose to the top of a float from the bottom of it, and dropped coated rice along a seed guide stayed on the rose soil. As a result, they were not seeded in the paddy field by the seeding wheel and carried on the surface of paddy field. For solution of these problems, some new mechanism were add to the float and the seed guide.For three years, many experiments have been tried on a soil tank and paddy field. The new seeding machine, which is able to seed the coated rice at the stable depth and in very week paddy field.It is expected that the result of this study will be made good use of, cultivation by DSSP will be popularized, and the cost of rice production will be reduced.