the effect of different irrigation intervals on water use efficiency and yield of rice (khazar variety)

this study was conducted to evaluate the water-use efficiency of rice (khazar cultivar) at rasht research institute of rice. the treatments were four different irrigation intervals (two, five, eight and 11 days) in a randomized complete block design (rcbd) with three replications. the plot size was 15 square meters in area and 50 cm in depth. the spacing between plants was 25 x 25 cm and the soil tissue was silty-clay. the polyethylene pipes were used to irrigate the plots. the consumed water was measured in the pipes for each plot. the yield was measured in a six square meter area. the differences between treatments were significant for grain yield, number of un-filled grain, consumed water (p< o.o1) and for 100 grain weight (p< o.o5). the differences of yield between two and five days interval were not significant, but their consumed water was significantly different (p< o.0i). thus the irrigation interval of five days for khazar cultivar in gilan province can be recommended.