天津市汉沽区营城乡濒临渤海沿岸,位于蓟运河下梢,土壤盐碱较重,是一年两季稻麦连作区。据调查,该地区春季麦田主要杂草有灰菜、篇宿;夏秋季稻田则有稗草、三棱草、牛毛毡、带子草、藻类以及水绵等,这些杂草和作物争养分,争水分,争劳力,严重地威胁着稻、麦作物的正常生长,是生产上 Hangu District, Tianjin Yingcheng Township on the verge of the coast of the Bohai Sea, located in the Jishun River shoots, soil salinities heavier, is the year of rice and wheat with cropland. According to the survey, the main weeds in the spring wheat field in the region are gray vegetables and articles, while the summer and autumn rice fields are barnyard grass, triangular grass, cattle blankets, tapestry grass, algae and cotton buds. Water, fight labor, a serious threat to the normal growth of rice, wheat crops, is production