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东北地区农田杂草发生和为害较为严重,农田常见杂草约有300余种,造成严重为害的杂草约30～40种,草害面积约有4000～5000万亩,减产200～250万吨。自党的十一届三中全会以来,农田化学除草有了较大发展,全区现已推广使用了20多种除草剂;除草对象逐步扩大,由水稻、小麦、大豆逐步发展到杂粮和经济作物;除草剂类型和施药方式有了变化,由土壤处理增加了苗后茎叶喷洒,防除面积也大大增加。据统计,1985年东北三省农田化学除草
The occurrence and damage of farmland weeds in northeast China are more serious. There are about 300 kinds of common weeds in farmland, about 30-40 kinds of weeds which cause serious damage, the area of grass damage is about 4000-500 million mu and the output is reduced by 200-2.5 million tons . Since the Third Plenary Session of the Eleventh Central Committee of the Communist Party of China, there has been a great development of chemical weed control in farmland. Over 20 kinds of herbicides have been promoted and used in the region. The weeding targets have been gradually expanded from rice, wheat and soybeans to grains and economy Crops; Herbicide types and application methods have changed from the soil treatment increases the spraying of stems and leaves of post-emergence, control area is also greatly increased. According to statistics, in 1985 the three northeastern provinces farmland chemical weeding