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为了有效反映大田条件下,紫茎泽兰对茄科植物生长和产量的直接危害和经济危害允许水平,采用添加系列试验和模型拟合的方法观察了不同紫茎泽兰密度下茄子的株高和产量变化,以及茄子田间透光率和紫茎泽兰水肥积累量的变化。结果表明,当紫茎泽兰密度为1～2株/m2时,对茄子株高、结果数和产量无影响,当紫茎泽兰密度增加到5株/m2以上时,茄子株高、结果数和产量显著降低。紫茎泽兰的株高、对田间透光率的干扰程度和水肥积累量是茄子减产的重要原因。双曲线模型(1/y=-0.0108+0.2083/x)可以较好地拟合紫茎泽兰密度与茄子产量损失间的关系。茄子田间紫茎泽兰的经济危害允许水平为0.192%～1.282%,经济阈值为0.03～0.26株/m2。
In order to effectively reflect the direct damage and economic hazard of solanaceous plant growth and yield under the field conditions, the plant height of eggplant under different Eupatorium adenophorum was observed by adding series of experiments and model fitting And yield changes, as well as the transmissibility of eggplant fields and the accumulation of water and fertilizer Eupatorium adenophorum changes. The results showed that when the density of Eupatorium adenophorum was 1 ~ 2 plants / m2, there was no effect on plant height, number of fruits and yield of Eggplant. When the density of Eupatorium adenophorum increased to above 5 plants / m2, The number and yield are significantly reduced. The height of Eupatorium adenophorum, the degree of interference with the light transmittance in the field and the accumulation of water and fertilizer are the important reasons for the decrease of eggplant yield. The hyperbolic model (1 / y = -0.0108 + 0.2083 / x) can well fit the relationship between Eupatorium adenophorum density and eggplant yield loss. The economic hazard of Eupatorium adenophorum in eggplant field is 0.192% ~ 1.282%, and the economic threshold is 0.03 ~ 0.26 plants / m2.