玉米是我国北方的主要旱田作物 ,田间杂草种类多 ,数量大 ,危害严重 ,应用化学除草剂是防除旱田杂草的重要措施之一。但目前推广应用的除草剂通用性差 ,杀草谱窄 ,药效不稳定 ,价格较高 ,有的除草剂还影响间作和轮作 ,不利于种植结构调整。为此 ,我们于 2 0 0 0年对 5 0 %禾宝? Corn is a major upland crop in the northern part of our country. There are many kinds of weeds in the field with large quantities and serious harm. Application of chemical herbicides is one of the important measures to prevent weeds in dry fields. However, the general applicability of herbicides is poor in versatility, narcotic herbicides are narrow, efficacy is not stable, the price is higher, and some herbicides also affect intercropping and rotation, which is not conducive to the adjustment of planting structure. To this end, we are 50% Wo Po in 2000?