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为了进一步有针对性的选择防治秦皇岛市杂草优势种群的有效化学除草方法，由秦皇岛市山海关区、昌黎县、抚宁县及青龙县植保站等部门组织对市区内农田杂草进行了全面普查并调查、取样，采用倒置W九点取样法。调查器具为样方框０．２５（平方米），即边长为０．５m（米）的正方
In order to further target the effective chemical weeding method to control dominant weed populations in Qinhuangdao, we conducted a comprehensive survey of farmland weeds in urban areas by departments such as Qinhuangdao Shanhaiguan Districts, Changli County, Funing County and Qinglongxue Plant Protection Station And investigation, sampling, using inverted W nine sampling method. The survey instrument is a square of sample square 0.25 (square meters), that is, a square with a side length of 0.5 m (meter)