自８０年代以来，我国玉米田化学除草技术发展迅速，乙草胺、阿特拉津除草剂及二者的复配制剂相继在玉米产区大面积推广。但是，连续使用几年后，玉米田杂草种群结构发生变化，在一些地方药效显著下降，一次性芽前除草已不能控制草荒。为解决这一课题，从１９９４年开始，... Since the 1980s, the technology of chemical weeding in corn fields in China has been developing rapidly. Acetochlor, atrazine herbicides and their combination preparations have been extensively popularized in maize producing areas one after another. However, after several years of continuous use, the structure of the weed population in the corn field has changed. In some places, its efficacy has been significantly reduced. One-time pre-emergence weeding can no longer control the grassland shortage. To solve this problem, since 1994, ...