Abstarct: Drought stress is the most important factor limiting the production of many crops in arid and semi-arid regions. The phenomenon of drought in Iran is considered one of the most important limiting factors of agricultural production. Barley is one of the most adaptable grains, which is of high importance in Iran in dryland and irrigated areas. One of the strategies to reduce the effects of drought damage and increase production in barley plants is nutrition management and determining the appropriate irrigation times in water-limited conditions. Low irrigation was done in 2019. The experiment was carried out as a factorial split plot in the form of a basic randomized complete block design with three replications. Factors include low irrigation stress at three levels (complete irrigation, interruption of irrigation at the time of pollination, interruption of irrigation at the time of seed filling) as the main plots, potassium silicate solution spraying treatment at three levels (0, 4 and 8 mg/L) and the sucrose solution treatment was at three levels (0, 15 and 30 mg/L). The results showed that stopping irrigation at the beginning of pollination and seed filling caused a significant decrease in plant height, relative leaf water content (RWC), phenosynthetic pigments (a, b and total), grain yield, thousand seed weight and index was taken But proline increased due to low irrigation stress in the grain filling stage. On the other hand, the results showed an increase in peduncle length due to potassium silicate foliar application and an increase in shoot dry weight due to sucrose foliar application. The three-way effect of low irrigation stress, potassium silicate, sucrose (i×si×s) on proline and photosynthetic pigments was significant. In this study, the highest seed yield (6070 kg/ha) was obtained by spraying 30 and 8 mg/liter of potassium silicate and sucrose, which showed a significant increase of 43.53% compared to the control. Also, as a result of foliar spraying of 8 and 30 grams per liter of potassium silicate and sucrose, the highest relative content of leaf water (45.01% and 45.76%, respectively), chlorophyll a (3.29 mg/g fresh weight), Chlorophyll b (4.85 mg/g fresh weight), total chlorophyll (8.14 mg/g fresh weight), carotenoid (0.91 mg/g fresh weight), number of seeds per spike (53 respectively) 39.39 and 39.00), the weight of one thousand seeds (42.22 grams) and the harvest index (41.04 and 41.02 percent) were obtained. Finally, from the examination of the treatment compounds, it was concluded that the concentrations of 8 and 30 mg/liter of potassium silicate and sucrose are recommended as a fertilizer formula or a new nutritional method.