| A GGE-biplot analysis was employed in this research to examine the agronomic traits including stem height, tuber quantity per plant, stem quantity per plant, and tuber fresh weight per plant of 11 potato varieties in regional trials of Guizhou province during 2010—2011. G1-G11 were designated for representations of these eleven cultivars and E1-E5 were used for the five testing sites, respectively. The yield data of eleven potato cultivars from five testing sites were analyzed. The results indicated that the yield performances of G9 (Weishu 001), G2 (Xuanshu#2), G4 (2005-1), G6 (0402-7), G7 (0402-2), and G5 (W04-36) were higher than others. Whereas, cultivars G8 (Panshu#1) and G10 (Heimeiren) had the lowest yield performance. The cultivars G6 (0402-7), G8 (Panshu#1), G5 (W04-36) were more stable than others and G11 (Mira) had lowest stability among all cultivars. Taken together, the cultivars G5 (W04-36) and G6 (0402-7) were better in stability, adaptability and yield performance. Among the five test sites, E2 (Bijie), E1 (Anshun), and E3 (Fenggang) had better differentiations than others. E4 (Liupanshui) and E1 (Anshun) were typical representations of the overall testing sites but E3 (Fenggang) had the lowest representativeness. E1 (Anshun) had the best differentiation and representativeness among five testing sites. In summary, GGE-biplot was one of the reliable methods that breeders could use for analyzing and evaluating the potato yield performance and agronomic traits in regional trials. |