A field experiment was carried out during 2021/2022 and 2022/2023 seasons in Almawhoub, Aldakhla, New valley Governorate, Egypt. This investigation aimed to study the effect of spraying three wheat cultivars with different concentrations of salicylic acid (SA) on the growth and yield traits. Randomized complete block design (RCBD) using split plots in strips arrangement with three replications was used.
The cultivars Sakha 95, Giza 171, and Gemmiza 11 were assigned in vertical strips while spraying with three concentrations of salicylic acid (0, 45, 60, and 75 ppm) were allocated in horizontal strips. In addition, three SA application times, i.e., 30, 45 and 60 days after planting were allocated in the sub- units. The experimental unit area was 10.50 m².
The results proved that mean effect of spraying wheat plants by salicylic acid at 75 ppm in both seasons gave the highest mean values of  plant height (116.5 and 121.8 cm), maximum number of spike/ m² (344.4 and 358.2 spike / m²), the highest 1000 grain weight (49.5 and 51.66 g), and the maximum grain yield (19.37 and 20.18 ardab/ fed)in the first and second seasons respectively. Foliar application at 60 days from planting registered the maximum average values of all studied traits under investigation. Spike length was insignificantly affected. Here too, the obtained results showed that Sakha 95 cultivar surpassed the other studied cultivars in grain yield (ardab/ fed), No. of spike/m², and 1000 grain/weight. Gemmiza 11 was better than the other cultivars in plant height and spike length. Most of interactions revealed that spraying wheat plants by 75 ppm salicylic acid after 60 days from planting registered the highest values of studied traits.