부산대학교 도서관

We investigated the effects of the drainage day after submerged direct seeding on the emergence and establishment of rice seedlings in pot experiments for the application of the new direct seeding method with a “shooting hill-seeder”. Draining flooded water after sowing rice seeds coated with calcium peroxide into puddled soil caused soil contract in due to the decrease of soil water (liquid phase) increased solid phase and change of soil structure. Draining immediately after seeding produced an air phase in the soil due to increase of air permeability in the soil. In contrast, no air phase was found in the soil flooded or drained five days after seeding. Furthermore, in the pots drained immediately after seeding the days to the second leaf emergence was decreased, and the dry weights of shoots and roots of the seedlings were increased compared with the pots with flooded and those drained on the fifth day after seeding. These results suggest that drainage immediately after seeding improves the rates of emergence and establishment of submerged direct-seeded rice seedlings.