Abstract
Eight inbred lines of maize were used in complete diallel crosses programe to estimate the components of genetic variance using Hayman analysis in addition to heterosis on the base of deviation of hybrids from mid parents and from best parents . The characters studied were number of days to 50% of tassel development ,number of days to 50% of silk development ,plant high(cm),height of main ear(cm),number of leaves over the main ear, number of leaves for plant ,leaf area(cm),ear diameter (cm),ear length (cm), number of rows/ear, number of grain/ear, 100-grain weight, plant grain yield(gm), oil percent and protein percent. The results showed both addition and dominance variance were important and significant for all character at 1% eaccept for ear diameter which was not Significant additive variance . Heterosis way delectated for crossZP-670xZP-505 on the base of deviation of hybrids from mid parents and from best parents for plant high ,high of main ear, number of leaves for plant ,leaf area ,ear diameter,ear length , number of rows/ear, number of grain/ear, 100-grain weight, plant grain yield and oil percent .
