玉米双杂交种,具有很大的增产优势,已为国内外的科学研究和生产实践所证明。目前全世界播种玉米双杂交种的面积约十亿亩左右,占玉米面积的三分之二以上。苏联、罗马尼亚等社会主义国家,已经达到了普及,使玉米的产量大大增加。我省从一九五九年开始对春杂5号,威641号等十个玉米双杂交种,在全省范围内进行了区域试验和生产示范,结果表明:有九个普遍金皇 Corn hybrids, with a large yield advantage, for domestic and foreign scientific research and production practices have proved. At present, the area of ​​two-hybrid corn sown around the world is about one billion mu, accounting for more than two thirds of the corn area. The socialist countries, such as the Soviet Union and Romania, have reached universal proportions and have greatly increased their corn output. From 1959 onwards, the province began to conduct ten regional trials and production demonstrations on 10 maize hybrids such as Chunza 5 and Wei 641. The results showed that there were nine common golden emperors