通过对辽宁省沈阳、庄河、昌图、阜新四地的田间试验,建立了花生田苗后有草日数或无草日数与产量损失率间的函数关系模型,明确了辽宁省花生田杂草的生态经济防治阈期为花生出苗后14～44 d。在此期间保持田间杂草少于经济防治阈值,既可确保杂草造成的减产率低于3%,又能充分发挥杂草在生态系统中的积极作用。 Through the field experiments in Shenyang, Zhuanghe, Changtu and Fuxin of Liaoning Province, a functional relationship model was established between the number of grassy days after the emergence of perennial grass or grassland and the rate of yield loss. The results showed that the weed of peanut field in Liaoning Province The threshold of ecological and economic control is 14 ~ 44 days after emergence of peanut. In the meantime, keeping weeds in the field less than the threshold of economic control can not only ensure that the weed reduction rate caused by weeds is less than 3%, but also give full play to the positive role of weeds in the ecosystem.