الفهرس 
Effect of Irrigation regimes:Only 14 pages are availabe for public view
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Abstract
This study aimed to assess the growth and yield characteristics of newly developed bread wheat varieties under water-stress conditions. Two field experiments were carried out at the Faculty of Agriculture, Fayoum University, specifically at the Demo farm, during the agricultural seasons of 2019/2020 and 2020/2021. The results of the study indicated that completely omitting irrigation had the most significant negative impact on growth, grain yield and yield components. Based on the study mentioned, it was observed that irrigation plays a crucial role in the stem elongation stage of crop growth. When irrigation was not provided during this stage, there was a significant reduction in growth, yield and yield components compared to the control with full irrigation. Among the varieties studied, the Sids-14 variety exhibited the highest grain yield, followed by Giza-171 under normal irrigation. However, when it came to drought tolerance, the Misr-3 and Sakha-95 varieties displayed the highest yields under drought conditions. The study also examined drought indices and stress, particularly focusing on the crop stability index for yield and harvest index traits. It was found that there were significant differences among the different crop varieties. The Giza-171 variety was identified as the least drought-tolerant, showing higher values for the stress susceptibility index in terms of grain yield and harvest index under intermittent irrigation.
On the other hand, the Misr-3 and Sakha-95 varieties performed well in terms of drought tolerance during flowering. The Sids-14 and Misr-1 varieties showed uniqueness in terms of their response to reduced irrigation during the vegetative growth stage.
Key words: Wheat, Skipping Irrigation, Wheat Varieties, Drought indices and yield and yield components