| This experiment was conducted in 2020 and 2021 for two consecutive years with nine silage maize genotypes（ ' Dajingjiu 26 ', G1; ' Lihe 228 ', G2; ' Ximeng Silage 707 ', G3; ' Wuke Silage 107 ', G4; ' Lidan 656 ', G5; ' Meng Silage 1812 ', G6; ' Jingke silage 932 ', G7; ' Yu silage 23 ', G8; ' Huamei No.2 ' , G9）was used as the material to study the fresh yield of multiple cropping silage maize after cutting stubble at the flowering stage of autumn sowing triticale in Lintao and Jingchuan. The results showed that except that G4 in 2020 and G3 in 2021 failed to achieve the best harvest period in Jingchuan, the other genotypes could reach the silage maize harvest standard in two test points in two years, and the dry matter content of all silage corn was 22.74~41.74%, which met the silage requirements. The single factor analysis results showed that the average fresh yield in 2020 (77.01 t·hm-2) was significantly higher than that in 2021 (49.57 t·hm-2), the average fresh yield of Lintao (73.75 t·hm-2) was significantly higher than that of Jingchuan (52.85 t·hm-2), and the average fresh yield of G8 (74.51 t·hm-2) was the highest among the genotypes. Under the interaction of two factors, the average fresh yield of nine genotypes in Lintao was higher than in Jingchuan in the same year, and the average fresh yield of nine genotypes in 2020 was higher than in 2021 in the same test site. Under the interaction of three factors, the fresh yield of G8 was the highest in Lintao in 2020 (109.36 t·hm-2) and 2021 (63.79 t·hm-2), and G6 was the highest in Jingchuan in 2020 (80.73 t·hm-2) and 2021 (59.75 t·hm-2). The comprehensive evaluation of GGE biplot on the production performance and experiment site discrimination of silage maize showed that ' Dajingjiu 26 ', ' Yu Silage 23 ', 'Jingke Silage 932 ' and ' Meng Silage 1812 ' had both high yield and stability, and were suitable for planting as multiple cropping genotypes in the central and eastern regions of Gansu, and Jingchuan can be used as an ideal pilot for screening silage maize genotypes due to the stable yield of silage maize varieties between years. |