我国北方夏播玉米田杂草共有20个科、38个属43种,其中以禾本科杂草为主,占总种数的23.6％。主要杂草有升马唐、牛筋草、稗草、狗尾草、反枝苋、马齿苋、苍耳、香附子、铁苋菜、藜等。一些局部地区发生比较严重的杂草有律草、酸模叶蓼、田旋花、打碗花、苘麻、醴肠、狗牙根、鸭跖草等。由于杂草种类多,且玉米播期正值雨季,温度适宜,杂草出草期长,生长迅速,极易形成大龄 There are 20 families and 38 genus of 43 species of summer sowed maize weeds in northern China, of which weeds dominated, accounting for 23.6% of the total species. The main weeds are horse crab, tendon grass, barnyard grass, Setaria, Amaranthus retroflexus, purslane, Xanthium, Cyperus rotundus, iron amaranth, quinoa and so on. Some of the more serious weeds in some areas are lawn grass, acid mold Polygonum, Convolvulaceae, Daoxianhua, Sumai, Liqi, bermudagrass, Commelina and so on. Due to the variety of weeds, and corn sowing date coincides with the rainy season, the temperature is suitable, the weeds have a long period of grass growth and rapid growth, can easily form the older