Abstract
Six varieties of common wheat (T. aestivum. L) (Sham 4, Adnania, Tamuz 2, IPA 99, Maxi paik, and Abu-Graib) were used in partial diallel crosses. The varieties were planted in 2007 – 2008 of Malta research station . Duhok to produce eight hybrids. In season 2008 – 2009 the hybrids and parents were sown in the field in a randomize complete Block Design with three replication. The characters studies were yield, its components harvest index , biological yield and protein percentage. A significant difference among genotypes (parents and F1 crosses) for all characters were detected. Mean squares of general and specific combining abilities were significant at 0.01 for all characters. The parent Abughreb and maxipake showed highly general ability effects for all traits except for protein and spike length . The value of additive genetic variance was more that the dominance for the most traits also broad sense and narrow sense heritability was high for all traits. The hybrids (Shamy × Maxipake) , (Tamuz 2 × Maxipake) showed heterosis that measured as deviation of F1 from mid parent for most characters there fore in these crosses, a hybrids variety development programme was suggested.
