Degradation of Napropamide in Soil under Different Environmental Conditions

摘要：

　　The potential of herbicides for nonpoint ground water pollution depends on their degradation behavior in soil.The present study was conducted to investigate the degradation of napropamide in soil under different conditions.The rate of napropamide degradation in soil was determined by extracting and detecting residual levels over a 60 d incubation period.In the five tested soils, degradation profile of napropamide followed the first-order kinetics.Soil organic matter (OM) greatly facilitated degradation of napropamide.The degradation rate of napropamide in soil increased with increasing temperature.Half-lives (T1/2) values ranged from 51.7 d at 35 ℃ to 93.6 d at 10℃.Soil moisture content influenced the herbicide degradation in the following order: 80 > 60 > 40 >20% water holding capacity (WHC).The prolonged T1/2 by sterilization showed that microorganisms were the predominant contributors to degradation of napropamide in soil.The degradation of napropamide declined as the initial concentration increased.The results suggest that to reduce translocation to surface and ground water, this herbicide application should be conducted at a minimum effective application rate considering environmental factors, especially soil OM, temperature and moisture.

关键词： napropamide soil degradation environmental factor

作者: Xiaomao Wu Youhua Long Renxiang Liu Ming Li

作者单位: Dept.of Plant Protection,College of Agriculture,Guizhou University,Guiyang 550025,China Guizhou Key Guizhou Key Laboratory for tobacco quality,Guiyang 550025,China Dept.of Plant Protection,College of Agriculture,Guizhou University,Guiyang 550025,China

会议类型: 国内会议

会议名称: 第十四届全国农药学科教育科研研讨会暨赵善欢学术思想与研究实践讨论会

会议地点: 广州

会议语种:英文

页码: 140-150

在线出版日期: 2014-08-03（万方平台首次上网日期，不代表论文的发表时间）