A field experiment was carried out during 2017/18 and 2018/19 seasons at
the Agronomy Department Experimental Farm, Agriculture Faculty, Assiut University, to study the effect of foliar spray by some Nano micro-nutrients on production of three bread wheat cultivars. The experiment was laid out in randomized complete block design (RCBD) using strip plot arrangement with three replications. Foliar spray with tap water (solvent as a control) and Foliar spray with Fe, Mn, Zn, Fe+Mn, Fe+Zn, Mn+Zn and Fe+Mn+Zn in Nano form at 200 ppm were allocated horizontally, while bread wheat cultivars (Sids-1, Sids-12 and Gemmeaza-11) were arranged vertically. The obtained results show that the foliar spray treatment by some micro-nutrients Nano-particles had a significant effect on plant height, kernels number spike-1 , 1000 kernel weight, kernel weight spike-1 and grain yield in both seasons. Thus, wheat plants which were sprayed by Fe+Mn+Zn produced the highest mean values of the most previous traits. Furthermore the studied cultivars had a significant effect on all studied traits. In
addition, Gemmeaza-11 cultivar produced the highest mean values of most studied traits in the two growing seasons. Here too, the interaction between some micro-nutrients Nano-particles and bread wheat cultivars had a highly significant (P ≤ 0.01) and significant (P ≤ 0.05) influence on grain yield in the first and second seasons respectively. Thus, the highest mean values of grain yield (26.80 and 26.95 ardab fed.-1 in the tow respective seasons) were obtained from Gemmeaza11 cultivar which was sprayed by Fe+Mn+Zn Nano-particles in both seasons.