鲁西南地处黄河冲积平原，是我国夏大豆主要产区之一。夏大豆播种期一般在６月中旬，气温高，雨水充足，极有利于杂草的发生和生长，杂草种类多，危害重。据运用倒置“Ｗ”９点取样法调查，豆田杂草有１５科２８种，双子叶杂草占４１．２％，单子叶杂草占５８．８％，相对多度 Southwest Shandong is located in the alluvial plain, is one of China’s major soybean producing areas. Summer soybean sowing period is generally mid-June, high temperature, adequate rainfall, is very conducive to the occurrence and growth of weeds, weed species, endanger heavy. According to the survey using the inverted “W” 9-point sampling method, there were 28 families of 15 legumes, 41.2% of dicotyledonous weeds and 58.8% of monocotyledonous weeds, the relative abundance