国外玉米单交种选育的若干情况

• 出 处: 陕西农业科技
• 发表日期: 1971年05期
• 关键词: 玉米单交种 单交种 双交种 玉米播种面积 自交系 三交种 五十年代 双穗玉米 特殊配合力 玉米植株

近年来,玉米单交种在许多国家中迅速推广。从五十年代末期开始,美帝由栽种双交改为重点发展单交种,1969年单交种面积占玉米总面积的50％以上。匈牙利过去主要栽种双交种,但近年来改为着重发展单交种和三交种。1970年单交种面积计划达到玉米播种面积的30％,如加上三交种,将占玉米总面积的50％左右。其他国家也正在加强玉米单交种

In recent years, single-seed corn has been rapidly promoted in many countries. From the late 1950s onwards, the United States and the emperor switched from planting double crossings to focusing on the development of single cross-breeding. In 1969, the area of ​​single cross-breeding accounted for over 50% of the total area of ​​corn. In the past, Hungary mainly used double crosses, but in recent years it has focused on the development of single and triple crosses. In 1970, the area planted for monoculture reached 30% of the acreage planted with maize, which, if combined with the three cross breeds, will make up about 50% of the total area of ​​maize. Other countries are also stepping up their maize crosses