Abstract :
: In order to study the effect of water deficit irrigation regimes on yield, yield components and quality traits of three bread wheat cultivars (Triticum aestivum L.) in Isfahan, an experiment was carried out in a split plot layout with randomized complete block design in three replications. Three irrigation regimes (based on 70mm, 90mm and 110mm evaporation) was devoted to main plots, and three wheat cultivars (Ghods, Mahdavi and Roshan Back-Cross) located in sub-plots. No significant differences were found between irrigation after 70mm and 90mm evaporation treatments with the exception of wet gluten. Delay in irrigation from 70mm to 90mm evaporation, significantly increase wet gluten. Irrigation after 110mm evaporation significantly reduced grain yield, yield components and wet gluten. However delay in irrigation from 70mm to 90mm evaporation significantly increased grain protein percentage. Cultivars were not significantly different in grain yield, protein percentage and wet gluten. However, Mahdavi,s cultivars had the highest grain yield and protein percentage. The results indicated that wheat may be irrigated after 90mm cumulative pan evaporation not only may save about 22% in irrigation water with no significant loss in yield under conditions similar to this experiment, but also grain protein percent increase 1.7%.
