Two field experiments were carried out at Etay El-Baroud Station, El-Beheira Governorate, Agricultural Research Center (ARC), Egypt to evaluate the effect of the three irrigation intervals and potassium silicate of the maize grown in the 2017 and 2018 seasons. The treatments of the two factors were distributed in a split-plot design in the four replications. Where  three irrigation intervals (10, 15, and 20 days) were assigned in main plots, meanwhile the four  foliar applications of potassium silicate (once spray at 40 days after sowing), twice sprays at 40 and 60 days after sowing, three sprays at 40, 60 and 80 days after sowing) and control (water spray) were allocated in a subplot in both seasons. The results revealed that irrigation every 15 days gave the highest values of growth of maize. Foliar application three times of K- silicate gave the highest values of growth characters. However, irrigation every 15 days with foliar application of K- silicate at three times recorded the highest values of the most growth characters in both seasons.