الفهرس 
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Abstract
SUMMARY
The present investigation was carried out at the Agricultural Experimental Farm of the Faculty of Assiut University during 1993 and 1994 seasons. The main objective was to study the variability in some agronomic characters, heat and drought tolerance among hundred dwarf grain sorghum genotypes (ninety eight) which were introduced from U.S.A. and two short Egyptian commercial varieties. (Dorado and Pioneer).
The experimental design was the simple lattice with repeating the basic design twice. The genotypes were sown on 22ffi and 23ffl June in 1993 and 1994 seasons, respectively. The experimental plot was single row, six meters long and 60 cm apart, hills were spaced 20 cm apart. Plants were thinned to two plants per bill. Separate analysis of variance of data was done for each season. Combined analysis of variance was also calculated over the two seasons as R.C.B.D. design.
The phenotypic (u2) and genotypic (U2g) variances, coefficient of variability, heritability (h), expected genetic advance (GA%) and covariance were computed. Moreover, the phenotypic (rp) and genotypic (rg) correlation coefficients between different pairs of studied characters were estimated.
The obtained results could be summarized as follows:
I- (a) Variability studies:
1- Highly significant differences were found between genotypes for all studied characters in 1993, 1994 seasons and their combined