This study was conducted to investigate the variation of rice quality and the effect of labor-saving by using slow-releasing fertilizer when doing direct drill seeding on flooded paddy surface by large scale direct drill seeding machine in Honam plain area. The results obtained by changing the amount of slow-releasing fertilizer in 2008, 2009 are as follows. Considering rice growth, head rice yield and rice quality, the optimum amount of slow-releasing fertilizer was 7kg/10a, when doing direct drill seeding on flooded paddy surface in southern plain area of Korea. When using slow-releasing fertilizer 7kg/10a, the protein content became lower, and head rice ratio became higher than that of conventional nitrogen split application method as basal fertilization, top dressing at tillering stage, fertilization at panicle initiation stage.

• Jae-Kwon Ko(Department of Rice and winter Cereal Crop, NICS, RDA)
• Won-Young Choi(Department of Rice and winter Cereal Crop, NICS, RDA)
• Tae-Sun Park(Department of Rice and winter Cereal Crop, NICS, RDA)
• Young-Doo Kim(Department of Rice and winter Cereal Crop, NICS, RDA)
• Nam-Hyun Back(Department of Rice and winter Cereal Crop, NICS, RDA)
• Bon-Il Ku(Department of Rice and winter Cereal Crop, NICS, RDA)
• Hong-Kyu Park(Department of Rice and winter Cereal Crop, NICS, RDA)
• Min-Kyu Choi(Department of Rice and winter Cereal Crop, NICS, RDA) Corresponding author