在我场影响黄豆高产稳产的诸因素中,草害已上升为主要因素,严重时减产60—70％。近两年,我们通过试验、示范,大面积推广了黄豆田两次化学除草。实践证明,两次化学除草相当于三次人工除草的效果,可以基本上消灭草荒现象。具体作法是: Among the factors affecting the high and stable yield of soybeans in our field, the grass weed has risen to the major factor, with a serious decrease of 60-70%. In the past two years, we have popularized the chemical weed control in soybean fields by experiments and demonstrations. Practice has proved that two chemical weeding is equivalent to three times the effect of artificial weeding, which can basically eliminate the phenomenon of grass shortage. The specific approach is: