EVALUATION OF 21 WHEAT BREEDING LINES IN 6 ENVIRONMENTS

Twenty one promising wheat breeding lines were evaluated for yield at six different seeding dates to determine superiority of the genotypes over a wide range of environments. Genotypes differed significantly an d highly significant genotype-environment (GE) interaction was obserev ed. The genotype AnFM139905-3-7-1-2 showed combined linear and non-lin ear responsibility for GE interaction. Seven lines (nos. 8-14) might b e considered most stable and suitable for wide adaptation to time of s eeding, due to their near unity of regression coefficient (b(i) = 1), insignificant deviation from regression (S-di(2)) and higher mean yiel d. The genotypes 1, 7 and 18 had the b(i) values near unity with insig nificant deviations may also be considered stable, bur unacceptable du e to their lower mean yield. The genotypes 6, 16 and 20 were unstable and unsuitable because of significant S-di(2) values, even their highe r mean yield.