Studies on the Characters of Grain Fillng and Flag Leaf Senescence of Rice Raised and Transplanted by Different Ways

The characters of grain filling and flag leaf senescence of rice raised and transplanted by different ways viz. dry-land raised and hand transplanted rice (DHR)?plastic plate raised and throwing rice (PTR) and wet-land raised and hand transplanted rice (WHR) were studied. WHR had the longest active growth day (D) , but it had the lowest mean growth rate ( G m) and initial growth potential ( R 0), flag leaf senescence rate and grain filling were slower in early days, faster in late days, respectively. DHR had the highest R 0 and G m and the shortest D , flag leaf senescence and grains filling were faster in early days, slower in late days, respectively. PTR grain filling parameters value and flag leaf senescence were always in the middle of the two others. There was a good negative correlation between grain filling and flag leaf senescence.