Wheat is one of the most basic and important sources of nutrition in the world. Finding a solution to reduce the effect of drought stress on its quantitative and qualitative performance can help countries to achieve greater food security. In order to investigate the effect of silicon on agro physiological properties of wheat under drought stress, this experiment was conducted as a factorial in a randomized complete block design with three replications. During two cropping years 2019-2020 and 2020-2021 It was carried out in the research farm of Karaj Soil and Water Institute Experimental treatments include drought stress at three levels without stress, mild stress and severe stress with 75, 50 and 25% of soil moisture usable as the first factor, respectively. And potassium silicate in four levels of non-use of control silicon and 20 kg , ha as soil used in stemming and concentrations of 2.5 and 5 kg , ha foliar application in stem stage, spike emergence and pasteurization stage as the second factor of cultivar was implemented in two years. The results of analysis of variance showed the effect of drought stress and silicon on grain yield, spike length, stem diameter, plant height, chlorophyll a concentration were significant. The results showed that in the interaction of non-drought stress with foliar application of 5 kg , ha, the best grain yield was 7892.00 kg. Based on the results of the present study, it seems the application of silicon as soil application and foliar application has improved grain yield.
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