Genotype × Environment Interaction and Seed Yield, Oil and Protein Contents Stability of Soybean Genotypes

Stability of seed yield, plant height, 100-seed weight, oil andprotein content were studied in ten soybean cultivars at Alexandria andEl-Hammam, Egypt during 2000, 2001, 2002 and 2003 seasons. Twostability parameters were estimated; viz., linear regression coefficient(b) and deviation from regression (S2d) for each cultivar. Significant cultivar× environment interactions were detected for all studied traits.Ranges of b-values were 0.67 to 1.47 for plant height, 0.56 to 1.57 forseed yield, 0.39 to 1.47 for 100-seed weight, 0.66 to 1.47 for oil content,and 0.68 to 1.56 for protein content. Values of S2d were significantin three genotypes for plant height and protein content, four genotypesfor seed yield, eight genotypes for 100-seed weight, and seven genotypesfor oil content. Elgin and Davis were the most stable genotyp