Study on the Direct Underground Sowing Machine in the Submerged Paddy Field

Appropriate Sowing Depth and Rice Plant Growth

Abstract

The following were learned from the results of experiments conducted seeking to find the appropriate sowing depth for Calper-coated seed rice.
1. As the sowing depth becomes deeper, the first leaf sprouting rate drops and plant height and dry weight are reduced.
2. If the sowing depth is too shallow, the seeds float to the surface after planting. If the seeds are sown at the depth of 8-12mm or deeper, however, almost no seeds float so the surface.
3. It is important to plant after soaking the seed well in the water. It is not necessary to germinate the seed before planting.
4. Even if sown early, when it is cold, germination will not come earlier.
5. If the bases of the rice plants are covered by even a little soil, it is possible to prevent the toppling over of the rice plants at their bases.
6. With cultivation involving direct planting of seeds in submerged paddy field, it is necessary to sow seeds of high specific gravity.
7. It is thought that the sowing depth of around 10mm is appropriate for paddy field direct-planting cultivation.