“京杂6号”是北京市东北旺农场科技站于1979年育成。母本为“330”,父本为“许052”。我县于1980年引进试种,表现良好。1981年继续在平原地区几个公社扩大试验示范,面积达28,000亩,经过两年不同气象条件的考验,表现显著抗病增产,一般亩产都在1,000斤左右,高产地块可达1,300斤以上。 京杂6号玉米在我县属中晚熟种,据1981年试验,4月17日播种,4 “Beijing Miscellaneous No. 6” is the northeast of Beijing farm science and technology station bred in 1979. The female parent is “330” and the male parent is “Xu 052”. My county introduced in the trial in 1980, performed well. In 1981, several communes in the plains continued to expand experimental demonstration covering an area of ​​28,000 mu. After two years of tests under different weather conditions, they showed marked resistance to disease and increased production. Generally, the average mu yield is about 1,000 kg and the high-yield land plots can reach 1,300 kg or more . Beijing hybrid No. 6 maize in my county is a late-maturing species, according to the 1981 test, April 17 planting, 4