Abstract: A field experiment with japonica rice variety Wuxiangjing 14 in 2002～2005 showed that the appropriate sowing rate was 150～180 g per tray (1624 cm²), seedling-strengthening agent was more conducive than compound fertilizer in improving the quality of machine-transplanted seedlings, the rational dose of compound fertilizer (N-P₂O_5^-K₂O) was 150 g·m^-2, seedlings should be machine-transplanted within 21 days after sowing, densely planting a fewer seedlings in each cluster could improve the individual and population quality of machine-transplanted rice, and applying 315 kg·hm^-2 of N and 6∶4 of basal-tillering: heading fertilizer could obtain the highest rice yield. The marked increase of glumous flowers per unit area was the main cause of the increase of machine-transplanted rice yield.

Key words: Ecotone of temperate and subtropical zone, Landscape change, Agricultural landscape heterogeneity, Landscape conduit