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(一)夏大豆田杂草的种群结构:大豆收获前,随机抽查7块田,其中2块为稻麦茬,5块为豆麦茬。采用随机取样法,每块田取20点,每点1平方尺,调查杂草的种类和数量。调查结果,本地区夏大豆田有杂草15科32种,按发生危害情况,可分为三种类型:1.主要杂草:属豆田杂草的优势种群,对大豆产量影响最大。如马唐、狗尾草、苍耳、鲤肠、铁苋菜、青葙、菟丝子。
(A) of the summer soybean weed population structure: before the harvest of soybeans, randomly selected seven fields, of which two for the rice stubble, five for the bean stubble. Using a random sampling method, each field to take 20 points, each 1 square feet, to investigate the type and quantity of weeds. According to the survey results, there are 32 species of 15 families and 15 weeds in the summer soybean field in the region. According to the occurrence of the hazard, they can be divided into three types: 1. The main weeds: the dominant species of weedy weeds, have the greatest impact on soybean yield. Such as Crab, Setaria, cocklebur, carp intestinal, iron amaranth, barley, dodder.