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京早7号(黄早4×罗系3)是北京市农科院作物所同中国农科院作物所育成的一个适于夏播的早熟玉米杂交种。在北京平原地区,其生育期在95天左右,经我县连续几年的试验、示范,夏播亩产一般达七,八百斤。1977年在通县乔庄良种场麦茬平播京早7号玉米杂交种7亩,亩产1107斤,比参加示范的“京黄113”增产45.6%,比“农大54”增产27.2%。
Beijing early on the 7th (Huangzao 4 × Luo Department 3) is a crop of Beijing Academy of Agricultural Sciences with the Chinese Academy of Agricultural Sciences crop bred a suitable early summer sowing corn hybrids. In the plains of Beijing, its growth period is about 95 days. After several years of trial and demonstration in our county, the average yield per mu in summer sowing has reached seven and eight kilos. In 1977, Qichang County, Tong County, staged corn stubble crop early Beijing 7 early corn hybrids 7 acres, 1107 kg per mu, than participating in the demonstration of “Beijing Huang 113” increase 45.6%, “Nongda 54” 27.2% increase.