Comprehensive Analysis of Regional Test of Early Summer Maize Varieties from Beijing, Tianjin and Hebei Based on Biplot

To comprehensively analyze the adaptability, yielding ability and stability of early summer maize varieties tested in The Beijing, Tianjin and Hebei region, as well as the discrimination and representativeness of each test site, the yield, panicle length, panicle row number and 1 000-grain weight of 18 varieties（including control） were comprehensively analyzed at 10 test sites by constructing GGE biplots of experimental yield and main panicle traits in 2019 in this study. The results showed that Jingke 976 and Jingnongke 829 had good yield and stability. The experimental site in Shunyi distract of Beijing was closest to the ideal environment, and had good identification ability for yield, panicle length, panicle row number and 1 000-grain weight.