The studies on winter weeds in wheat fields were conducted during 1992—2000 The results showed that there were 20 species of winter weeds in wheat fields in Hebei province, and among them Capsella bursa-pastoris and Descurainia sophia were dominant weed species 80 to 90 percent of winter weeds emerged in fall, which were focal control target To control winter weeds in wheat fields, applying 2,4-D butylate in fall could obtain a higher effect and save 3/4 amount of herbicide than applying in...
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