This experiment was designed to investigate the effects of nanosilicon foliar application and to reduce the effects of salinity, drought and combined stresses on vegetative and physiological traits. The experiment was carried out in the conditions of hydroponic cultivation on the mint plant (native species in the north of Iran) in a factorial form in a completely randomized design and based on the Taguchi method. This experiment was carried out in the growth room of the Horticultural Science and Engineering Department of Arak University under artificial light in the spring and summer of 1402. To create dry stress, polyethylene glycol 6000 was used based on Michel Kaufman's formula at three levels of zero, one and two bar. Salinity stress was applied at three levels of zero, 10- and 20-mM using sodium chloride salt solution. Foliar spraying of silicon nanoparticles was done at three levels of zero, 100 and 200 mg/liter. The results showed that the effect of foliar spraying of silicon nanoparticles in both concentrations of 100 and 200 mg/liter was significant in reducing the effects of salinity and drought stress and their interaction on some vegetative and physiological traits. Also, foliar spraying of silicon nanoparticles at a ncentration of 200 mg/liter improves the efficiency of water consumption and increases plant transpiration. The analysis of sodium and potassium elements in leaves showed that in the conditions of salinity and drought, foliar spraying of silicon nanoparticles at a concentration of 200 mg helps to reduce sodium ccumulation and increase the amount of potassium in leaves.
