GGE-Biplot analysis of multienvironments yield trials of Egyptian cotton (Gossypium barbadense L.,)

GGE biplot technique is one of the most appropriate methods for investigating genotype x environment interaction. A total twenty Egyptian cotton genotypes were tested to evaluate stability and adaptability during two agricultural years at four environments using randomized complete block design with six replications. The analysis variance showed that effect environments, years, genotypes, was highly significant lint yield / plot. Also, interaction due G Y E also significant. variation sum squares divided GEI 25.261 %, 0.574 36.660 % 3.396 respectively revealed maximum mean values in El-Gharbiya then Kafr El-Sheikh. Comparative performance through by (GEI) produced 2019 followed results first second principle components accounted 87.96 5.86 respectively, 93.82 variance. polygon view led identification top genotypes. G6, G7 G15 ideal which has highest coupled stability. could be used as a benchmark selection. While, desirable (G2, G4 G5) characterized high but less E2 across have ability discriminate Four had long vectors small angles (acute) are correlated clustered mega-environment. breeder should under new reduce costs.