الفهرس 
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Abstract
The present research work was carried out at Awlad Sakar District Sharkia Governorate during 2001/ 2002 and 2002 / 2003 winter growing seasons to estimate the genetic variance and separate the genetic components for eight bread wheat cultivars 1.e. Sakha 92 Sakha 69, Sakha 8, Giz a 160, Gemmiza 7,Gemmieza 3, Giza 163 and Giza 164 using diallel one way. To study some morphological characters, main spike characters and yield and yield components characters. The results summarized as follows: 1Significant mean squares for general and specific combing ability for all studied characters. 2The cultivar Sakha 92 was good general combiner for more studied characters. 3The crosses Sakha92 X Giza160 were the best crosses for grain yield and some related characters. 4Hertability was high for plant height 81% flag leaf area 54 % in narrow sense, spike length 74%, grain weight/spike 60%, number of tellers/plant 68%. While it was less than 5% for remining characters.