Tahany, Noreldin and Hasham, Abd el-bakey( 2017). Response of some rice cultivars to different irrigation regimes in North Nile Delta, Egypt. Fayoum J. Agric. Res. & Dev., Vol. 31, No (1):162-173.
Abstract: A field experiment conducted at El-Serw Agricultural Research Station in Demiatte Governorate, Egypt, during 2013 and 2014 seasons to determine the effect of irrigation intervals(irrigation every 6 days and 12 days)and irrigation depth(3, 5and 7 cm) on grain yield of three cultivars Sakha101, Giza177andGiza178), as well as its water productivity. The treatments were arranged in split-split plot design with four replicates, where main plots were assigned to irrigation interval, sub plots were assigned to irrigation depth and sub-sub plots were assigned to cultivars. The results indicated that there were variations among cultivars for the studied attribute under irrigation intervals, where irrigation every 12 days reduced all characters, compared to 6 day interval. Sakha101 attained the highest panicle grain weight, number of tillers, 1000-grain weight and straw yield under irrigation intervals every 6 days with 7cm of water depth in both growing seasons. Furthermore, Giza178 attained the highest 1000-grain weight, grain yield in the first growing season every 6 days irrigation interval with 7cm of water depth. The highest water productivity was obtained from Giza178 when irrigated every 6 and 12 days, with water depth 3 cm, being 0.55 and 0.57 kg/m3, respectively. Furthermore, it showed the highest water productivity under 12 days irrigation interval and water depth 3 cm, 5 cm and 7 cm, where, water productivity were 0.57, 0.54 and 0.55 respectively. Sakha101 used the highest amounts of water, compared to Giza177 and Giza178. In general, the highest water productivity underevery 12 days irrigation interval and 3 cm water depth where indicated for Giza178, where, grain yield reduction was 10.7%, grain yield was 2.5 ton/fed and the amount of saved water was 14%.Thus, it could be concluded that the highest water productivity was shown by Giza178 under all water regimes. Thus it is tolerance water stress and recommended for cultivation in stressed conditions especially at the end of the canals.
Keywords: (irrigation interval, irrigation depth, rice cultivars, water productivity.)
