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运用倒置“ Ｗ”９ 点取样法对山东省黄河三角洲、鲁西平原、沿海地区３ 个农区玉米田作农田杂草调查。结果表明，３ 个农区玉米田杂草有２１ 科５９ 种，其中双子叶杂草４５ 种，单子叶杂草１４ 种。按杂草优势多度等级排列，黄河三角洲玉米田杂草优势种组 合为马唐—牛 筋草—狗 尾草—小 藜—铁苋菜； 鲁西平原优势种组合为马唐—牛筋草—马齿苋—铁苋菜； 沿海农区优势种组合为马唐—牛筋草—马齿苋—香附子。
Inverted “W” 9-point sampling method was used to investigate farmland weeds in three agricultural areas in Yellow River Delta, Luxi Plain and coastal areas of Shandong Province. The results showed that there were 21 families and 59 species of weeds in three agricultural areas, including 45 dicotyledonous weeds and 14 monocotyledonous weeds. According to the degree of weed superiority rank order, the weed dominant species combination in the corn field in the Yellow River Delta was Crabgrass-Gleditsia sinensis-Stirlitazone-Tribulus terrestris-Iron amaranth. The dominant species in the Luxi Plain was Crabgrass- Amaranth - iron amaranth; the dominant species in the coastal farming area is Crabgrass - tendon grass - purslane - incense monkshood.