الفهرس 
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Abstract
Maize (Zea mays L.) is one of the most important cereals in Egypt due to its vast grown area, total production and cash value. It is essential for human consumption and livestock. Moreover, it is also used for industrial purposes such as manufacturing starch and cooking oils. Many efforts are devoted nowadays to increase its productivity through genetically improvement. In 2019 the corn grown area in Egypt was 1.125 Million hectares (2.76 million feddans) with an annual grain production of 7.95 Million metric tons and an average productivity of 10.08 ton ha-1 (24.2 ardab/feddan). (One feddan; fed =4200 m2 and one ardab; ard = 140 Kg). (USDA 2020).
Maximizing food and agricultural production, depends mainly on promoting high yielding maize hybrids to cover the mounting consumption of maize. This depends mostly on the produce new hybrid of maize across breeding programs. The ultimate goal of most breeding programs is the production of improved hybrids for commercial use through the evaluation of line genotypes for high yielding ability. To carry out a successful breeding program, the breeder should have enough knowledge about the type and relative amount of genetic variance components and their interactions by environment for different attributes (El-Hosary and El-Akkad 2015, Sidi et al 2019 and El-Hosary, 2020).