中白 8 1是以北京农家品种‘抱头青’及‘小青口’选育出的太NB和 2 157两个自交不亲和系配制的秋播晚熟高产型一代杂种。生长期 85～ 90d(天 ) ,叶绿色 ,叶柄白绿 ,叶球高桩叠抱 ,球高 4 0 .1cm ,球径 18.8cm ,单株毛质量 4 .2kg ,净球质量 3.2kg ,净球率 76 .2 %。平均每 6 6 7m2净菜产量可达 4 50 0～ 80 0 0kg。抗病毒病、霜霉病、软腐病。该品种已在北京地区、华北、东北等地区大面积推广种植 Zhongbai 8 1 is a late-maturing, late-maturing and high-yielding F1 generation bred by too much NB and 2 157 selfing incompatible lines bred by Beijing peasant families ’Baotouqing’ and ’Xiaoqingkou’. Growth stage 85 ~ 90d (days), leaf green, petiole white green, leaf pile high pile, the ball high 4.01cm, ball diameter 18.8cm, the quality of the plant hair 4. 2kg, net ball quality 3.2kg, net Ball rate 76 .2%. An average of 6 6 7m2 net dish output up to 4 50 0 ~ 80 0 0kg. Antiviral, downy mildew, soft rot. The variety has been in Beijing, North China, Northeast China and other regions to promote the large-scale planting