自1978年,我们从北京引进了玉米杂交种优良新组合“京杂六号”(自330×许052),推广面积已发展到玉米总播种面积的80%以上,成了当家品种。从1979年开始大量制种,经种子质量检验发现“京杂六号”一代种是黄粒白顶,其中有个别籽粒是黄粒黄顶。田间调查结果表明,制种田中,母本“自330”果穗上的黄顶 Since 1978, we introduced Beijing Jingza No.6 (from 330 × Xu 052), an excellent new combination of maize hybrids from Beijing, and the popularized area has grown to more than 80% of the total sown area of ​​maize and has become a mainstream variety. Since 1979, a large number of seed production, the seed quality inspection found that “Beijing hybrid sixth generation” is a white yellow top, of which individual grains are yellowish yellow top. Field survey results show that the system of farming, the female parent “since 330” on the yellow top of the ear