Wheat field weed survey was conducted using an inverted W-pattern with 9 sampling points in the north region of Heilongjiang province.
运用倒置“W”9点取样法，对黑龙江省北部大豆小麦轮作区小麦田做杂草调查。
Weed survey was conducted by sampling methods of inverted W-pattern to determine the species composition and structure of weed communities in maize fields in Hebei Province.
采用倒置“W”取样法对河北省玉米田杂草进行了调查，以明确田间杂草的种类组成及群落结构。
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