Two field experiments were conducted at Moshtohor region, Kalubia Governorate, Egypt, during 2020/21 and 2021/22 seasons, to study the effect of three water regimes (first treatment  Normal irrigation at tillering stage, elongation stage, heading stage, milk stage and filling stage or irrigation intervals 30 days among irrigations. Second treatment Three irrigations at end tillering stage and starting elongation stage, at end heading stage and starting milk stage and filling stage or irrigation intervals 50 days among irrigations. Third treatment Two irrigations at end elongation stage and starting heading stage and filling stage or irrigation intervals 70 days between irrigations) and three silica nanoparticles (zero nano silica, 50 mg L^-1 SiO2 and 100 mg L^-1 SiO2) on growth characters of bread wheat. Results were showed that normal irrigation gave the highest values and highly significance for all growth traits under study.