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利用玉米杂种优势,在国内外玉米生产实践中都起到了显著的增产作用。辽宁是全国春玉米生产的主要省份之一。回顾我省玉米生产与育种史况,结合玉米杂种优势利用的实际情况,进行具体分析,既可看出问题,又可为今后玉米种子事业的发展提供一点启示。我省1950～1951年为玉米农家品种整理阶段。1952年开始进行品种间杂交种的区域试验与繁育推广工作,1955年进入品种、品系间杂交育种阶段。
The use of maize heterosis in both domestic and foreign corn production practices have played a significant role in increasing production. Liaoning is one of the major provinces where spring corn is produced. Recalling the history of maize production and breeding in our province, combined with the actual utilization of corn heterosis, the specific analysis can not only see the problem, but also provide some inspiration for the future development of the corn seed industry. 1950 to 1951 in our province for the corn farmers finishing stage. In 1952 began to carry out regional trials of hybrid varieties and breeding promotion, in 1955 into the varieties, cross-breeding between strains.