الفهرس 
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Abstract
Three field experiments were conducted at the experimental farm of Rice Research and Training Center (RRTC), Sakha, Kafr ElSheikh, Egypt during three seasons of 2000, 2001 and 2002. The experiments were laid out in stripplot design with four replications. The horizontal plots were devoted to eight irrigation treatments; (1) continuous flooding, (2) water withholding for 12 days at midtillering stage (MT), (3) water withholding for 12 days at midtillering plus panicle initiation stage (PI), (4) water withholding for 12 days at PI stage, (5) water withholding for 24 days at (PI+H) stage, (6) water withholding for 12 days at heading stage (H), (7) water withholding for 24 days at (MT+H), and (8) water withholding for 36 days at (MT+PI+H). The vertical plots were allocated to the three rice cultivars i.e. Sakha 101, Giza 178 and Giza 182. The studied characters were as follows: (1.) DM g/m2 (2.) LAI 2. Chlorophyll content (4.) Heading date (5.) Light penetration (6.) Yield and its attributes (7.) Protein % in grain (8.) Hulling % (9.) Milling% (10.) Head rice % (11.) Total water used m3/ha (12.) Water saved % (13.) Yield reduction % (14.) Water use efficiency (WUE) The main results could be summarized as follows: (1) The best irrigation treatment was continuous flooding but the worst one the water withholding for 36 days at (MT+PI+H). (2) Water withholding at both panicle initiation and heading stages must be avoided to obtained considerable grain yield. (3) Giza 178 rice cultivar could be recommended under drought stress. 4) Water withholding for 12 days at midtillering stage for Giza 178 rice cultivar saved water with slight reduction in grain yield.