近来许多农户来电话、来信询问有关大豆苗后难治杂草如跖草、苍耳、问荆、刺儿菜、大刺儿菜、苣荬菜、芦苇等的化除问题。针对这一问题谈谈我的意见。近年来由于大豆田除草剂用量低及忽视农业机械灭草措施导致大豆田杂草群落迅速演变,上述难治杂草危害严重,常造成严重草荒。据黑龙江垦区 Recently, many farmers came to the telephone to inquire about the elimination of weed-resistant weeds such as soybean plantlets, cocklebur, quince, sage, sage, echinacea and reed. Talk about my opinion on this issue. In recent years, due to the low dosage of herbicide in soybean field and ignoring the measures of weeding on agricultural machinery, the weed community in soybean field evolves rapidly. The weed of the above refractory weeds are seriously endangered and often result in serious shortage of grass. According to Heilongjiang reclamation area