ORYZA SATIVA L. اثر مديريت هاي مختلف آبياري بر روي برخي صفات فيزيولوژيك و مرفولوژيك برنج

Effect of water management on some physiologic and morphologic characters in Rice (0ryza sativa L.)

This study was conducted to evaluate the effect of different irrigation management (Viz., irrigation after; 0, 3, 6, 9- day after disappearing water from plot surface, and control treatment was continuous irrigation) , as a field experiment of factorial design in RCBD with 3 replicates was performed at rice research institute ( Rasht, Iran) in 2001, to evaluate on seed yield, yield components, W.U.E. and some morphologic and physiologic characters in two rice cultivars (i.e. Binnam and Hassani). After transplanting and during anthesis, all plots were submerged, for10 and 15 days, respectively, and during the rest of stages, irrigation treatments were applied as were planned. The results showed that there was no significant difference among seed yield, biological yield and harvest index. So that, 9-day irrigation management (I5) decreased yield only 17 % compare to control treatment (non-significant decrease), as saved water was about 50%. There was a significant difference among number of tillers, panicles, percentage of unfilled grains, W.U.E. and different irrigation treatments (p . 1%). Moreover, there was a strong correlation between seed yield and seed number in panicle (r = 0.619..). In this study, despite the non-significant interactive effects between irrigation management and cultivar, the Binnam cultivar with average seed yield of 3097.6kg/ha and 9- day irrigation management with W.U.E. of 817.5g/m3 was found to be the best treatment combinations.