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京早7号玉米是北京市农科院作物研究所用母本黄早4与父本罗系3杂交选育而成的一个单交种,曾于1980年引入我区布点试验、示范。平均亩产800斤左右,最高的亩产可达1200斤。在生产实践中,该品种有以下几个特点:(1)生育期适中。在雁北约120天左右,可避免早霜危害。(2)双穗率高达70—85%。因两个棒同时长出,同时受粉、灌浆快,所以,双棒的成穗率达90%容易获得高产。(3)适应性和抗逆性强。不论是高水肥,轻盐碱和旱平地都适宜种植。(4)品质好,出粉率高。京早7号属半硬粒粉型,糖分和蛋白质含量较高,比同单7号好吃,轴细,出粉率较同单7号高10
Beijing early morning corn 7 is the Beijing Academy of Agricultural Sciences Crop Research Institute with Maternal Huang 4 and Paternal 3 Department of hybrid breeding, was introduced in my area of distribution test in 1980, demonstration. Average yield of about 800 pounds per mu, the highest yield of up to 1200 pounds. In production practice, the varieties have the following characteristics: (1) moderate growth period. Approximately 120 days in Yan Ge, early frost damage can be avoided. (2) double ear rate up to 70-85%. Because the two sticks grow at the same time, at the same time by the powder, grouting fast, so double stick into the spike rate of 90% easy access to high yield. (3) adaptability and resistance strong. Whether it is high water and fertilizer, light salt and dry land are suitable for planting. (4) good quality, high output of flour. Beijing early on the 7th is a semi-hard grain type, sugar and protein content higher than the same number on the 7th delicious, fine shaft, the output rate of more than the same single No. 7 10