一、前言杂草在农业生产中的为害性很大,不仅降低农作物产量,而且也严重影响其品质;因此,及时而彻底的消灭杂草是获得丰收的重要措施之一。特别是在我国东北地区,耕地面积大,劳动力缺乏,杂草问题显得更加突出,极待迅速加以解决。化学除莠是晚近十余年的事情,但发展却十分迅速。目前在禾谷类作物地中应用较广且卓著成效的除莠剂是卤代苯氧乙酸及其衍生物,然而这一类除莠剂也存在着一系列的 I. Introduction Weeds are very harmful in agricultural production. They not only reduce the output of crops, but also seriously affect their quality. Therefore, timely and thorough elimination of weeds is one of the important measures for harvesting. Especially in the northeast of our country, the area of ​​cultivated land is large and the labor force is scarce. The problem of weeds is even more prominent and it is extremely urgent to be solved promptly. Chemical herbicide is a matter that has lasted more than ten years, but the development is very rapid. The most widely used and effective herbicides currently used in cereal crops are the halophenoxyacetic acids and their derivatives. However, this class of herbicides also has a series of