京啤B121-5系中国农科院,品资所于1984年用美国“Manker”多棱大麦作母本,与日本韭崎10号作父本杂交,连续4年选择(温室加代与大田种植),经5年产量试验观察鉴定选育而成。京啤B121-5属春性多棱皮大麦,长芒、有锯齿、芽鞘绿色、幼苗直立、叶耳白色、叶片中宽、穗形直,株高85厘米左右,根系发达, Beijing Beer B121-5 Department of Chinese Academy of Agricultural Sciences, materials in 1984 by the United States “Manker” polygamous barley as a female parent, Japan Niu Qiqi 10 as the male parent crossbreed for four consecutive years (greenhouse and field planting ), After 5 years of yield test observation and identification of breeding. Beijing Brewing B121-5 is a spring polygonal leather barley, Changmang, serrated, bud sheath green, seedlings erect, white ears, leaves wide, spike straight, about 85 cm in height, root system developed,