紫茎泽兰对大蒜产量的影响及其经济阈值

Effects of Eupatorium adenophorum Spreng on the Garlic Yield and Its Economic Thresholds

在大田条件下,研究了紫茎泽兰对大蒜产量的影响及其经济危害允许水平和经济阈值,分析了紫茎泽兰密度与大蒜减产率的最优回归模型及危害大蒜产量的水分和养分竞争机制。结果表明,在紫茎泽兰对土壤养分和水分的竞争干扰下,大蒜产量随紫茎泽兰密度的增加而逐渐显著降低。双曲线模型可以较好地拟合紫茎泽兰密度(x)与大蒜产量损失率(y)间的关系(1/y=-0.018 286+0.435 75/x,F=261.79**)。大蒜田采用人工拔除杂草、10%草胺磷和24%氨氯吡啶酸对紫茎泽兰进行防除时,紫茎泽兰的经济危害允许水平分别为2.630%、0.277%和0.369%,经济阈值分别为1.09株/m2、0.12株/m2和0.16株/m2。

A field experiment was carried out to study the damage of Eupatorium adenophorum Spreng to garlic yield and its economic thresholds.The optimum regression model for the garlic yield loss and the density of Eupatorium adenophorum Spreng weed was established and the competitive mechanisms of nutrients and water to affect effecting garlic yield were discussed.The results showed that the garlic yield decreased significantly with the increasing density of weeds.The hyperbola model（1/y=-0.018 286＋0.435 75/x,F=261.79＊＊） could well fit the relation between the garlic yield loss（y） and the weed density（x）.The economic infestation levels for the Eupatorium adenophorum Spreng by manual weeding,10% Glyphosate and 24% Picloram were 2.630%,0.277% and 0.369% respectively,and the economic threshold were about 1.09,0.12 and 0.16 plant per m2 respectively.