... observed between grain yield and flag leaf N content under the low N condition, whereas it was not significant under the normal N condition. Under low N condition, grain yield was significantly ... normal N condition than those under low N condition in both cropping seasons. Grain yield was positively correlated with whole-plant dry weight in all restorer lines under both N conditions. ... lúa. 2. VậT LIệU V PHƯƠNG PHáP NGHIÊN CứU Vật liệu nghiên cứu gồm 10 dòng lúa thuộc nhóm ngắn ngy (R24, R20, R45, R50, Q5) v nhóm di ngy (R63, 9311, R27, D42, C71). Các dòng vật liệu đã đợc...