Abstract
The study aimed to select high-yielding, farmers-preferred quality sweet potato varieties that are suitable to grow in various environmental conditions in Bangladesh. In this context, four popular sweet potato varieties (viz., 'BARI Mistialu-8 ', 'BARI Mistialu-12 ', 'BARI Mistialu-14 ', and 'BARI Mistialu-15 ') were used in the study. These varieties were released by Bangladesh Agricultural Research Institute (BARI). In the first season (2018-2019), these varieties were evaluated at nine locations, and in the second season (2019-2020), the same varieties were tested further, but only in three locations. The trial was set up in a randomized complete block design and repeated three times. After two years of observation, it was found that the fresh root yield was varied significantly due to the environment (E), genotypes (G), and their (G x E) interaction (p <= 0.01) by using genotype and genotype x environment (GGE) biplot analysis. The E and G x E interaction effects were found to the greater than the genotypes effect solely. In the first year, three varieties, namely 'BARI Mistialu-8 ', 'BARI Mistialu-12 ' and 'BARI Mistialu-14 ', were identified as balanced and comparatively higher in yield in nine locations. These three varieties also showed a similar trend with respect to root yield in tested three locations in the second year. Among the four varieties, 'BARI Mistialu-12 ' was found to be the highest root yielder, followed by 'BARI Mistialu-8 ' and 'BARI Mistialu-14 '. Across the locations, these varieties showed 57.89%, 61.50% and 44.30% higher yield than the local check cultivar. Therefore, these three varieties may be recommended as the best varieties of sweet potato throughout the country.