麦田杂草生态经济阈值研究

Research on Weed Eco-economic Threshold in Wheat Field

猪殃殃、荠菜是豫西南麦田常见杂草,文中对这2种杂草对小麦的为害情况、经济阈值、防治指标等进行研究,结果表明:麦田猪殃殃和荠菜对小麦产量有显著影响,小麦产量损失率(y)与2种杂草密度(x)间呈S型函数关系,即y=e3.410-8.541/x,结合现行小麦价格、产量水平和防治费用等因素,制定了杂草生态经济阈值。

Descurainia Sophia and Capsella bursapastoHs were common weeds in wheat field in the southwest of Henan province. The damage situation, economic threshold and control index of these two weeds were investigated in this paper. The results showed the effect of D. Sophia and C. bursapastoris on wheat yield was significant. The relation between wheat yield loss rate （y） and D. Sophia and C. bursapastoris density （x） was sigmoid function model： y=e3.410-8.541/x. Combined with the wheat price, yield level and cost corevention and treatment, the eco-economic thresholds of the con- troll of D. Sophia and C. bubsapastoris were set up.