Effect of Stopping Irrigation at Different Growth Stages in Wheat Growth and Dry Matter Accumulation
IRAQI JOURNAL OF DESERT STUDIES,
2022, Volume 12, Issue 2, Pages 18-30
AbstractTo investigate the effect of stopping irrigation during different growth stages (As a simulation of water stress) in wheat growth, dry matter accumulation, and yield, an experiment was utilized by using the Randomized Complete Block Design (RCBD) included two wheat cultivars (Fayyad and Bora) and five non-irrigation treatments (control, no-irrigation at the seedling stage, no-irrigation at the tillering stage, no-irrigation at the flowering stage, and no-irrigation at the fulling seed stage) with three replications. The experiment was applied in the Field Crops Experiment Station located at University of Tikrit, Tikrit, Iraq during the 2021-2022 growth season. Total chlorophyll (mg gm-1) was extracted in each growth stage from control and no-irrigation treatment. The tillers number per plant (no. plant-1), flag leaf area (cm2), plant height (cm), dray matter (gm plant-1), and yield (kg m-2) were measured. The result indicated no difference between the two cultivars except in plant height. Fayyad was significantly higher in plant height 80.53 cm compared with Bora 76.53 cm. No-irrigation treatments reduced total chlorophyll significantly compared with control treatment by 11% in seedling, flowering, and fulling seed stages and by 16% in the tillers stage. No-irrigation at the tillering stage reduced significantly the number of tillers 21%, flag leaf area 43%, plant height 12%, and dry matter 19% compared with the control treatment. Also, the no-irrigation treatment at fulling and flowering stages reduced the yield by 36% and 28% respectively compared with the control. The outcome of this study will be useful to increase knowledge about the most sensitive growth stage to water stress in wheat, which contributes to better management of the irrigation process in desert and semi-desert areas and to spare plants water stress during those stages.
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