1704 Use of high efficient AMMI method to evaluate new Egyptian cotton genotypes for performance stability

Thirty six genotypes were grown at five locations over Nile Delta of Egypt. New approach for the additive main effect and multiplicative interaction AMMI method was applied. Where the effect of all interaction components combined in one number named Total Percentage of Absent Interaction (TPAI). The biplot of mean performance and TPAI may help the breeder to select genotypes which combine both stability and high performance for the studied traits. Highly significant mean square was obtained for genotypes, genotype-environment interaction and IPCA1 for all traits. The mean square for IPCA2 was highly significant for all traits except seed index where it was significant. The contribution of IPCA 1 for G x E sum squares was greater for lint percentage followed by seed-cotton yield. The highest contribution for IPCA 2 was for seed-cotton yield. Most of G x E sum squares, for all traits, could be attributed to IPCA 1, IPCA 2 and IPCA 3. The best genotypes were F6 661/03 (12), F12 854/03 (28), F12 865/03 (29) and G.89G.86 (32) where they exhibited high yield with high stability level for all traits. They followed by F9 802/03 (24) which bosses the highest yield with average stability for all traits