| The effect of amount of nitrogen and planting density on canopy apparent photosynthetic(CAP)rate,photosynthetic rate and chlorophyll content in flag leaves,yield components and grain yields were studied with indica hybrid rice Liangyoupeijiu in intermission irrigation in southern China seasonal drought hilly region.The results are as follows: as the increment of density,canopy apparent photosynthetic(CAP)rate increased before anthesis and decreased quickly during grain filling.Meanwhile photosynthetic rate in flag leaves,grain number per panicle,seed setting rate and 1000-grain weight decreased.As the increment of amount of nitrogen,canopy apparent photosynthetic(CAP)rate,photosynthetic rate and chlorophyll content in flag leaves,panicle number and grain number per panicle increased.But seed setting rate and 1000-grain weight increased.The result showed that the tiptop output is 10 298 kg/hm2 when the transplanting density is 281 250 hills/hm2 and the applying amount N-fertilizer is 225 kg/hm2 in intermission irrigation. |