Phenotypic stability, genotype × environmental interactions, and cultivar recommendations for essential oil yield in khus aromatic grass (Chrysopogon zizanioides (L.) Roberty)

The study was carried out to predict yield stability of the sixty vetiver accessions using various parametric/non-parametric statistics over two years. The pooled ANOVA and AMMI analysis expressed that environments/years (E), genotypes/accessions (G), and genotype × environment/years (G × E) interaction were highly significant, indicated that the accessions interacted differentially with different years. Therefore, it is imperative to that stability/adaptability analysis across the environments/years should be followed before the recommendation for commercial cultivation in any crops. Based on the stability analysis using AMMI model, accessions G-10, 23, 38 and 40 showed the widest adaptability/stability due to its ability to tolerate wide environmental conditions over years. Thus, these accessions can be recommended as the most stable accessions for cultivation for wide areas.