麦田婆婆纳生态经济阈值的研究

Studies on Eco-economic Thresholds of Veronica didyma in Wheat Field

试验结果表明 :麦田婆婆纳对小麦产量有显著影响 ,小麦产量损失 (y)与婆婆纳密度 (x)间呈幂函数关系 ,即y =0 .0 0 49x2 .0 4 6 3。结合现行小麦价格、产量水平和防治费用等因素 。

The results showed the effect of Veronic didyma on wheat yield was significant. The relation between wheat yield loss rate(y) and V.didyma.Tenore density(x) was simulated with the model:y=0.004?9x 2.046?3,combined with wheat price,yield level and cost and the eco-economic threshold of the ontroll of V.didyma were set up .