الفهرس 
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Abstract
Two field experiments were carried out at the Agricultural
Experimental farm of Faculty of Agriculture, Suez Canal
University, Ismailia Governorate, Egypt during two winter
seasons of 2012/13 and 2013/14. These experiments aimed to
study the effect of irrigation regimes (Full irrigation, skipping
irrigation at tillering stage and skipping irrigation at heading
stage) , nitrogen fertilization rates(50, 75 and 100 kg/fed) and
two wheat cultivars ( Sakha 94 and Sids 12 ) and their
interactions on plant growth characteristics beside to grain yield
and its attributes. The texture of experimental site was sandy
soil. Split-split plot design with three replications was
used.Drought stress conditions were created by skipping
irrigations at two plant growth stages. Exposure wheat plants to
drought stress treatments at tillering or heading stages
significantly decreased each of total chlorophyll, carotenoid
pigments, plant height, dry weight of biomass above ground/
plant, flag leaf area, leaf area index and crop growth rate at the
two growing seasons comparing to full irrigation treatment
(without skipping any irrigation). Meanwhile, proline content of
plant fresh weight increased by skipping irrigations at tillering
or heading stages. Increasing nitrogen fertilizer up to 100 kg
N/fed led to increase all traits under studying during two
growing seasons. Wheat cultivar Sakha 94 surpassed cultivar
Sids 12 (total chlorophyll, carotenoid pigments, plant height, dry weight of biomass above groundl plant, flag leaf area, leaf area
index and crop growth rate). Flag leaf area, total chlorophyll and
proline contents were affected significantly by interaction
between the studied factors. sids 12 cultivar was more affected
.,
negatively by skipping water irrigation compared with sakha 94.
Skipping one irrigation at tillering or heading stages as well as
increasing nitrogen fertilization level up to 100 Kg N Ifed led to
increase praline content of fresh leaf. Skipping one irrigation at
tillering or heading stages as well as increasing nitrogen
fertilization level up to 100 Kg N/fed increased flag leaf areal
plant in the second season. sakha 94 cultivar was more affected
positively by increasing fertilization of nitrogen up to 100 Kg
N/fed compared with sids 12 and that was true in the two
seasons.