الفهرس 
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Abstract
This study was conducted at the Agricultural Research and Experiments Station at the Faculty of Agriculture, Benha University, and included the hybridization of ten new pure strains of white maize using two distinct indicators (two pure strains). Twenty apical hybrids were obtained and were evaluated with two hybrids for comparison under two different levels of nitrogen fertilization, using a design Randomized complete blocks with three replicates. The following characteristics were recorded: number of days until 50% of the male and female inflorescences appeared, plant height and cob height (cm), cob length (cm), cob diameter, number of cob rows, number of seeds in a row, weight of 100 seeds, clearance percentage, and yield. Grain/plant. The data of each experiment was analyzed individually, then a meta-analysis was conducted according to Steel and Torrei (1980), and the general and specific ability to combine was estimated according to Kempthoren (1957), and the hybrid strength was calculated for all traits. The correlation coefficient between the traits and each other was studied, and factor analysis was conducted according to By Cattell (1965). The results obtained can be summarized as follows: - Analysis of variance and means of characteristics A.1. characteristics of earlyness:
+ The variance due to nitrogen fertilization was significant for the two characteristics of emergence date of 50% of the male and female kernels, and the number of days was more under the highest fertilization level (120 kg N/acre) than the lower fertilization level (80 kg N/acre). The variation was due to the genotypes (Apical hybrids + S.