Abstract
We compared the yield of the late-season seeded rice with that of the regular-season seeded rice for 3 years (2001-2003) in southern Japan. The yields of late-season seeded and regular-season seeded rice were the same on the average of 3 years, but in 2003 the yield of late-season seeded crops was considerably lower than that of the regular-season seeded crops. Meteorological conditions and dry-matter production analysis revealed that the yield in 2003 was lower because early growth before the maximum tiller number stage was inferior to that in the other 2 years due to poor sunshine before the heading stage. Because the early growth tended to be better in the dense-seeded plot, the growth in the dense-seeded plot was compared with that in the standard-density seeded in the late-season seeding culture for 2 years (2004 and 2005). CGR and tiller number before the heading stage were higher in the densely seeded plot than in the standard-density seeded plot, and panicle number and yield were significantly higher in the densely-seeded plot. These results suggest that the dense seeding condition is effective to stabilize the yield in late season seeding culture.
