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郑单8号玉米单杂交种,是我省农科院粮食作物研究所玉米抗病育种组,于1981年采用黄早四自交系作母本,自育32自交系作父本杂交育成。1982年初次参加夏玉米杂交种观察比较试验,在500多个杂交组合中名列第二,折亩产339.4公斤,较对照种郑单二号亩产259.05公斤增产31%.1983年选入夏播杂交种鉴定试验,平均亩产611.25公斤,较对照种郑单二号平均亩产533.95公斤增产14.48%.当年参加院多点示范,产量居13个杂交种的首位,平均
Zheng Dan No. 8 single hybrid corn maize, is the provincial Academy of Agricultural Sciences Institute of grain crop disease-resistant maize breeding group, in 1981 using Huangzao four inbred lines as the female parent, self-bred 32 inbred lines as male parent breeding . In 1982 for the first time to participate in summer maize hybrids observed and compared in more than 500 hybrids ranked second, yielding 339.4 kg per mu, compared with the control of Zheng Dan II per acre 259.05 kg yield 31% .In 1983 summer Sowing hybrids identification test, the average yield of 611.25 kilograms, compared with the control Zhengdan II average 533.95 kg per mu yield increased 14.48% .In that year to participate in the hospital more demonstration, the output of 13 hybrids ranked first, the average