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“京早7号”玉米系中国农科院用母本黄早四与父本罗系3杂交选育而成的一个单交种。1980年引入朔县在不同类型地区试种,1983年已推广到3.2万亩,适宜我省北部地区春播、南部冬麦区夏播。该品种具有下列6个特点:1.单产高,增产幅度大。经1980—1982年品比试验和大面积示范,京早7号比同单7号、忻黄单45号产量高,高水肥地增产20%以上,中水肥地成倍增长。1983年,朔县小平易公社祝家庄大队社员陈金山种植的1亩京早7号,亩产1,840斤,较同等条件下的同单7号增产84%。
“Beijing early morning 7” corn Department of Chinese Academy of Agricultural Sciences with the mother Huangzao Si and Paternal Line 3 cross-breeding of a single cross-breeding. Shuoxian introduced in 1980 in different types of test areas, 1983 has been extended to 3.2 million mu, suitable for spring sowing in northern regions, the southern winter wheat sowing. The varieties have the following six characteristics: 1. High yield, increase yield. Compared with the same number 7 and Xinhuang No.45, the yield of high-yield and high-water increased by more than 20% and that of medium-water fertilizers doubled. In 1983, 1 mu of Jingmu 7 on the 1st of the morning was planted in the village of Zhuojiazhuang, a member of Zhujiazhuang Brigade in Xiaoping County, Shuo County, with a yield of 1,840 catties, an 84% increase over the same number of No.7 on the same conditions.