벼 直播栽培 類型에 따른 生育 및 收量

This experiment was conducted to identify the growth and yield differences in rice cultural types : Broadcasting on flooded paddy surface (BF), drilling on flooded paddy surface(DF), puddled-soil drill seeding(PD), drill seeding on dried paddy flat(DD), and machine transplanting of 10-day old seedling (MT) at National Honam Agricultural Experiment Station in 1995. Among the cultural types of direct seeding, the number of seedling stand showed high in order of DD>BF>DF>PD. Tillering at early growth stage was faster in MT and effective tiller showed higher in MT than in direct seeding. Growth duration from seeding to heading was longer in direct seeding than in MT for 2~13 days of Dongj inbyeo and 10~18 days of Nonganbyeo. Root distribution ratio at the surface soil revealed high in order of BF>DF>PD> DD and MT. Culm wall thickness of 4th internode was thicker in machine transplanting of 10-day old seedling than in direct seeding, and the depth of buried culm showed deep by turns of MT>DD>PD> DF and BF. The height of center gravity and moment related to lodging revealed higher in direct seeding than machine transplanting that resulted high lodging index by turns of BF>DF>DD>PD among the direct seeding cultural type. Lodging was occured seriously in the order of BF>DF>PD>DD = MT in Dongjinbyeo but wasn’t significantly different in Nonganbyeo among the cultural type. The yield components and grain yield showed varietal differences but was not significantly different between in MT and in direct seeding, and among cultural types of direct seeding.