Evaluation of foxtail millet yield stability and adaptability using GGE-biplot analysis: A case study of ‘Yugu18’ foxtail millet cultivar

In this study, the GGE-biplot double plot software was used to analyze the high and stable yield and adaptability of 25 millet varieties such as ‘Yugu 18’ in the national millet regional test from 2010 to 2011, and evaluate the adaptability of the target region. The results of two-year regional experiment showed that: 1) the vertical foot of ‘Yugu 18’ on AEA axis was the closest to the square, and its high yield was excellent; the projection distance on AEC axis was the shortest, and its stable yield was outstanding. 2) ‘Yugu 18’ was the closest to the ideal variety, and its comprehensive performance of high and stable yield was better than that of the control variety ‘Jigu 19’ and other tested varieties. 3) ‘Yugu 18’ was the winner of polygon apex, and the most suitable planting area covers most areas of North China summer valley region, which was the most adaptable variety. 4) Compared with the yield of ‘Jigu 19’, ‘Yugu 18’ had obvious planting advantages in most areas of North China summer valley. It was showed the ideal characteristics of ‘Yugu 18’ for high yield, stable yield and wide adaptability in the summer valley region of North China, which provided theoretical basis for the popularization and application of ‘Yugu 18’.