大白菜是北京地区的主要蔬菜作物,随着北京菜地面积的减少,需选育高产量的大白菜来提高单位面积产量,以提高市场供应量提高市场,满足消费者需求。晚熟大白菜杂交种“京农988”,在2001-2002年北京市区域试验中,平均单产6995千克,比对照“北京新3号”增产9.6%。2001-2002年在北京 Chinese cabbage is a major vegetable crop in Beijing. With the reduction of vegetable area in Beijing, it is necessary to raise high yield of Chinese cabbage to increase yield per unit area so as to increase the market supply and improve the market to meet consumer demand. The late-maturing Chinese cabbage hybrid “Jingong 988” achieved an average yield of 6995 kg in the Beijing regional trial of 2001-2002, an increase of 9.6% over the control “Beijing New 3”. 2001-2002 in Beijing