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随着种植业结构调整，耕作制度的变化，杂危害已成为影响廊坊市大豆高产的主要因素一。全市大豆常年播种面积３万hm２，均不同度地受到杂草的危害。为了指导农民有效地治大豆田杂草，我们于２００１年开展了大规模普查工作。通过在大豆开花初期对不同土壤地，不同区域的大豆田
With the adjustment of planting structure, farming system changes, miscellaneous hazards has become a major factor affecting the yield of soybeans in Langfang City. Perennial soybean planting area of the city 30,000 hm2, are weeds in different degrees of harm. In order to guide peasants in effectively controlling weeds in soybean fields, we conducted a large-scale census in 2001. Through the early flowering of soybean on different soil, different regions of the soybean field