الفهرس 
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Abstract
A field experiment was carried out at the Experimental Farm and the Laboratory of Seed Technology at Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt to investigate the effect of irrigation intervals on grain yield and quality of some mize hybrids during 2013 and 2014 growing seasons. A split plot design with three replicates was used. The main plots were devoted to three irrigation intervals (10, 20 and 30-day) and the sub –plots were assigned to three hybrids of corn (SC 128, SC130 and SC168). Some traits such as ear length, ear diameter, number of rows per ear, number of kernels per row , grain yield (ton/hac.), final germination percent, electrical conductivity, 100-grains weight, oil percentage, protein content, moisture content, root length, shoot length, seedling fresh and dry weight were measured. from the obtained results and from the economic point of view under the same conditions, it can be concluded that sowing S.C. 168 and irrigation every 10- days interval could be recommended for maximizing maize yield and its components as well as, grain quality and viability.