江苏省小麦田间杂草的生态经济防治阈期  

Eco-economic Critical Period of Weed Control in Wheat Field of Jiangsu Province

作　　者：李永丰[1] 娄群峰[2] 李宜慰[1] 黄开红[2] 周恒昌 

机构地区：[1]江苏省农业科学院植物保护研究所,江苏南京210014 [2]江苏省农业科学院农业现代化研究所,江苏南京210014 [3]江苏省仪征市农业生产资料公司,江苏仪征214400

出　　处：《江苏农业学报》2001年第4期219-222,共4页Jiangsu Journal of Agricultural Sciences

基　　金：国家"九五"攻关项目 ( 96 0 15 0 1 0 3 0 9)

摘　　要：通过多点试验 ,建立小麦田苗后有草天数或无草天数与小麦产量损失率之间的函数关系 ,探明江苏省小麦田间杂草的生态经济防治阈期。结果表明 :江苏省小麦田间杂草的生态经济防治阈期约为小麦出苗后 17～ 87d ,相当于小麦全生育期的 9 5 %～ 48 3% ,此时小麦处于 3叶期至 7～ 8叶期 ,此阈期的始期和终期 ,为田间杂草密度及生物量的快速增长期。在此阈期内保持田间无草 ,既能保证杂草造成的减产率低于 3 % 。Functional relationships between the weedy or weed free days and the yield loss rate of wheat were set up to ascertain the eco economic critical period of weed control in wheat field through field experiments in Jiangsu Province The critical period for weed control in wheat field was about 17(3 leaf stage)to 87(7～8 leaves stage)days after wheat emergence,which was about 9 5%～48 3% of whole wheat growth season.Notable increase of density and biomass occurred at the begining and ends of the critical period,respectively.Weed free during the critical period could not only assure wheat yield loss less than 3%,but also make the most of the weed in field ecosystem.

关 键 词：小麦田杂草 生态经济防治阈期 产量损失率 作物-杂草竞争关键期 

分 类 号：S451.1[农业科学—植物保护]