الفهرس 
Introduction
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Abstract
The aim of this investigation was to investigate the variability among five inbred lines and their crosses of maize. The inbred lines were ( G 507 A , G 516 , G 278 , Rg 5 and Rg 8 ). Using morphological methods of assessment to furnish standard uniform and definitive information of the characteristics of the genotypes .Consequently, such information would supply a great deal of knowledge which in turn support quality control and certification procedures thus, keep the purity of the superior maize genotypes under multiplication and to avoid or minimize genetic contamination under the environmental conditions of Dakahlia district. In 1st May 2007 growing season, the seeds of 5 parental inbred lines were crossed according to a half diallel crosses mating design to obtain 10 single cross. Inbred parents and their F1 single crosses were evaluated through 2008 season to determine the role of general and specific combining ability and heterosis for some agronomic traits. Also the morphological characters were evaluated for identification between maize crosses. Results indicated that mean squares of genotypes were highly significant for all studied traits. General combining ability (GCA) and specific combining ability (SCA) mean squares were highly significant for all studied traits. The GCA/SCA ratio was less than unity for all studied traits. Significant positive GCA effects were found for all studied traits and best combiners were Rg5 and Rg8 inbred lines. these inbred lines could be considered as good combiners for improving these traits. Significant positive SCA effects and heterosis values were found for all studied traits. The morphological identification was conducted using the International Union For The Protection Of New Varities of Plants.