| Abstract: |
Two separate line x tester experiments of white and yellow maize were carried out during two summer successive growing seasons i.e., 2003 and 2004 at demonstrative field in EL-Malkiean village, EL-Hosseinea district and Ghazala village, Zagazig district in Sharkia Governorate for estimating combining ability, genetic variance components, heritability, heterosis, genotype-environment interaction as well as stability parameters using line x tester of 7x3 by employing local genotypes of white and yellow maize.In 1st summer growing season, both of 7 inbred maize lines and 3 testers either white or yellow maize were sown, each in separate experiments on two sowing dates, i.e. 11 June and 21 June. Seven white inbred lines were crossed with 3 different testers, i.e., Sids 7, Sids 6 and Giza 2. At the proper time, 7 yellow maize inbred lines were crossed with 3 different testers, i.e., Composite 21 yellow, Gm. 1004 and Gm. 1021 by hand crossing.In the 2nd growing season 2004, the obtained seeds of white and yellow maize parental genotypes i.e., inbred lines (7) + testers (3) + top crosses (21) + check varieties (2) were tested separately in two trials planted side by side in eight different environments, i.e., two sowing date in 1st May and 1st June under two nitrogen levels, i.e, 288 Kg N/hectare (medium-N) and 360 Kg N/hectare (high-N) and two locations at Ghazala village and Elmalkiean village in a randomized complete block design with three replications and at the proper time the following characters were recorded.
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