辽宁省花生田杂草的生态经济防治阈期研究

Study on eco-economic threshold period of weeds control in peanut field in Liaoning province

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。

The relationship function model between yield losses rate and days of peanut growing after seedling with weeds in the field and the days without weeds was established by field experiments in Shenyang,Zhuanghe,Changtu and Fuxin regions in Liaoning province.It was made clear that the eco-economic threshold period of weeds control in peanut fields of Liaoning is 14~44 days after peanut seedling.Controlling of weeds in threshold period could make the deduce yield rate below 3 percent,and brought weeds in ecological system into positive and full play.