الفهرس 
Experimental schemeOnly 14 pages are availabe for public view
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Abstract
The present investigation aimed to study the genetic behavior of groups of white inbred lines their single crosses under different environments, years, fertilization and population densities. The diallel crosses among ten selected inbred lines made in 1992 season were evaluated under four different environments; two plant densities, 20 000 (Dl) and 30 000 (Dl) plants per faddan and each alternated with two nitrogen levels 80 kg N (N1) and 160 kg N (N2) per faddan over two years (1993 and 1994) in the farm of the Sakha Agriculture Research Station. Four environmental conditions designated as DINI, D1N2, D2N1 and D2N2 were proposed under which the genotypes would be tested each experiment consisted of the 45 crosses plus one commercial cross single cross 10 (S .C 10) as a control. The 46 genotypes were tested in each of the four environmental condition in two years 1993 and 1994 which comprise 8 experiments (4 x
2= 8) in randomized complete block design, with two replicates. The variations among entries in each environment were calculated in both years. The four experiments over the two years were combined in one analysis of variance including; between the genotypes the environments or years and the possible interactions among them. Average heterosis were calculated relative to mid all crosses. The variations among crosses were further partitioned into the general and the specific combining ability, components. Also general and speclfic combining ability effects for the ten inbred lines were computed according to Grifing’s method 4 model-I (1956). The data was taken on grain yield kg./plot and adjusted to ardlfad.), sillung date, plant and ear height (cm), ear length (cm), ear diameter (cm), number of rowslear, number of kernelslrow and weight of 100 kernels (gm).