Author/Authors :
Li، X.K. نويسنده College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China. , , Hill، P.W. نويسنده School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd LL57 2UW, UK. , , Li، Y.C. نويسنده College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China. , , Wang، Y. نويسنده College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China. , , Ren، T. نويسنده , , Cong، R.H. نويسنده College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China. , , Lu، J.W. نويسنده College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, Wuhan 430070, China. ,
Abstract :
Understanding the physiological processes associated with high yield traits in modern crop varieties is essential to further increase grain yield and improve nutrient management strategies. Field trials were conducted to study the effects of fertilization and variety on the grain yield of rice (Oryza sativa L.) with two fertilizer levels and 18 modern varieties. The objectives were to evaluate yield components, time courses of dry matter production and time courses of N, P2O5 and K2O accumulation among different yield categories and to determine physiological processes associated with yield-trait relationships. Variation among varieties had a considerable impact on rice grain yield, regardless of fertilization. Close correlations were observed between grain yield and effective panicles, dry matter production and N, P2O5 and K2O accumulation. Differences in dry matter production and P2O5 accumulation among different yield categories began at anthesis; differences in N and K2O accumulation emerged earlier. It can be concluded that consistent increases in dry matter production (especially post-anthesis) and N, P2O5 and K2O accumulation are crucial for further improvements in rice yield-trait relationships.
