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.