Introduction: Agriculture, especially cereals, plays a very important role in food security. Among cereals, wheat is one of the most important crops in terms of cultivated area and production rate in the world, and plays an important role in providing the food needs of human societies. Among the environmental factors, salinity stress has been the subject of much global research for more than 100 years as one of the most important factors in reducing the production of agricultural products, and for about 50 years, it has received serious attention from researchers in our country. Many different solutions have been proposed to increase the performance of agricultural plants under different stress conditions, one of which is the use of plant growth regulators and their effect on the plant's hormonal balance.
Materials and Methods: To investigate the effect of foliar application of growth regulators of gibberellic acid, salicylic acid and cytokinin on physiological traits of wheat under salinity and water stress conditions, a split plots experiment based on randomized complete block design with tree replications was conducted in two agricultural research Station and farms in the northern plain of Golpayegan city during the 2022-2023 cropping seasons. The first treatment of salinity stress includes: a. Irrigation with EC: 1.5 ds / m^-1 (first farm) and b. Salinity stress with irrigation water EC: 10 ds / m^-1 (second farm) as an environmental factor, the second treatment of water stress with 2 irrigation levels: a. After 90 mm of cumulative evaporation from the Class A evaporation pan, b. After 120 mm of cumulative evaporation from the Class A evaporation pan as the main factor, the third treatment was the application of growth regulators of salicylic acid, gibberellic acid, and cytokinin at the level of 100 ppm, and the control treatment (no use of growth regulators) as a secondary factor. The examined traits included leaf area index, total dry matter, net assimilation rate, relative growth rate, crop growth rate, chlorophyll a, b, and grain yield.    
 Results and Discussion: The non-saline environment and the irrigation level of 90 mm evaporation from the class A pan, compared to the saline environment and the irrigation level of 120 mm evaporation, increased the index of leaf area, total dry matter, net assimilation rate, relative growth rate, product growth rate and chlorophyll a, b. The interaction effect of environment × irrigation level × growth regulators showed the highest grain yield in non-saline environments at the irrigation level of 90 mm, evaporation from the class A pan in the gibberellic acid + cytokinin treatment at the rate of 8979.00 kg/ha and at the irrigation level of 120 mm, Evaporation from class A pan was observed at the rate of 7557.33 kg/ha in gibberellic acid +cytokinin treatment. The highest grain yield under salinity stress conditions at the irrigation level of 90 mm evaporation from class A pan in gibberellic acid × salicylic acid Treatment at the rate of 6737.33 kg/ha, and at the irrigation level of 120 mm evaporation from class A pan in gibberellic acid+ salicylic acid +cytokinin treatment was observed at the rate of 5138.33 kg/ha.
Conclusion: The leaf area index and the production of more photosynthetic substances increased the growth rate of the plant. With the increase in plant growth in the final stages due to the decrease in the ratio of photosynthesizing organs to non-photosynthesizing organs, and by shading the upper organs on the lower organs and reducing the photosynthetic power per unit area, the amount of leaf area, dry weight, and the growth rate of the product and the relative growth rate of the product decreased. The decrease in the dry weight of the aerial organs and the leaf area index at the end of the growing season is probably due to the fall of the leaves and the negative net assimilation. The relative growth rate changes with changes in the state of photosynthesis and respiration of the plant, and for this reason, with the passage of time, the growth of the plant becomes negative with an increase in the amount of respiration at the end of the growth period.