الفهرس 
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Abstract
Two field experiments were carried out in 2017 and 2018 summer seasons at Itay El-Baroud Research Station, El-Beheira governorate, Egypt Agriculture Research Center, to study the effect of three irrigation intervals (10 days interval (I1), 15 days interval (I2) and 20 days interval (I3). And four treatments of foliar spray with liquid potassium silicate (K2SiO3) (10% K2O, 25% SiO2) with concentrations 1000 cm3/L (kindly obtained from Abo Ghaneima Company for fertilizers and chemical industries) applied as following {Potassium silicate once foliar spray at vegetative growth stage (40day after sowing (S1)), Potassium silicate twice foliar spray at vegetative growth and flowering stages (40and 60 days after sowing respectively (S2), Potassium silicate three-times foliar spray at vegetative growth, flowering, turger grain stages (40, 60 and 80 day after sowing respectively (S3)) and control (water spray (S4))}.
A split-plot design with four replications in the two seasons of study where; the main plot were designated for irrigation intervals while; sub-plots were designated for foliar spray with potassium silicate.
The results will be summarized as follows:
5.1. Effect of irrigation intervals (I).
5.1.1. Vegetative growth characters:
Results is obvious that, all of the studied characters were significantly affected by irrigation intervals (I), except leaf area index (LAI) and ear passion (%).Number of leaf per plant as affected by irrigation intervals in 2018 season only, number of leaf per plant was increased significantly as irrigation water quantities increased and irrigation regime decreased. Hence, the largest number of leaf per plant was found when the maize plants irrigated every 10-days (I1)) on the opposite, the lowest number of leaf per plant was measured at 20-days irrigation regime (I3) interval. In both for, leaf area per plant, plant height and ear height were significantly affected by irrigation intervals in 2017 and 2018 seasons, maize plants were supplied water every 10-days (I1) had the highest values (1.068 and 1.451, 250.84 and 226.75cm and 127.84 and 122.00cm) for this characters in both seasons, respectively. While maize plants were exposed at 20-days irrigation regime (I3) interval recorded the lowest values (0.980 and 1.008, 235.71 and 199.50cm, and 117.85 and 106.06 cm) for this traits in both seasons, respectively.