الفهرس 
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Abstract
Objectives: 1. To estimate the amount of heterosis 2. To determine hybrid performance for the nine selected inbred lines. 3. To establish the magnitude of both general combining ability (GCA) and specific combining ability (SCA) effects and their interaction with two locations. 4. To make comparison between the two Griffing’s methods of diallel cross (method 2 and method 4) in the present investigation. Methods& Results: A half diallel cross among 9 inbred lines of was evaluated under two locations (Fac. Agric. Moshtohor and Quesna menofiya Governorate) for some quantitative characters. General and specific combining ability were estimated according to Griffings (1956) diallel cross analysis designated as method 2 and 4 model 1 for each location as well as the combined over them. Location mean squares were significant for most traits under study, with mean values in L1 being higher than those in L2. In both methods, genotypes, combining ability were significant for all traits in both locations as well as the combined analysis. The efficiency of the both diallel methods of analysis for non additive gene effects based on F-test. The results indicated that significant F. test was detected for all traits in both locations as well as the combined analysis. The correlation coefficient of non-addiitive effects derived from two methods of diallel analysis over all traits in both locations as well as the combined analysis were highly significant indicating the strong relation between the Griffing,s methods in estimating non-additive genetic variance. Conclusion: The parental inbred lines no. 9, 1 and 8 seemed to be good combiners for yield and some of its components in both methods of analysis. The crosses P1xP4, P1xP8, P1xP9, P4xP7, P6xP9 and P8xP9 showed the highest values for SCA effects for grain yield and its components in both methods of analysis. There were strong relation between the Griffing,s methods in estimating additive, non-additive genetic variance and error.