稻茬免耕油菜除草剂在土壤中的消解动态  

Degradation Dynamics of Herbicide in Soil of No-tillage Rape with Rice Stubble

作　　者：段婷婷 魏进 叶照春 何永福 

机构地区：[1]贵州省植物保护研究所,贵州贵阳550006

出　　处：《贵州农业科学》2013年第7期101-104,共4页Guizhou Agricultural Sciences

基　　金：贵州省科技厅年度公关项目"稻茬免耕油菜化学除草技术规程制定研究与示范"[黔科合NY字(2009)3031];贵州省科技厅带帽项目"贵州省主要农作物病虫草害预测预报及防控技术研究"[黔科合带帽字(2007)5003]

摘　　要：为探明稻茬免耕油菜土壤中除草剂的消解动态,通过田间试验,采用NaHCO3等溶液提取,分别用液相色谱带紫外和荧光检测器测定,建立了土壤中草甘膦、百草枯的提取和检测方法。结果表明:添加量为0.5～5.0mg/kg时,草甘膦、百草枯在土壤中的添加回收率为76.4%～96.2%,变异系数为2.89%～7.22%;土壤中草甘膦、百草枯的残留消解动态符合C=AeBt的指数回归方程,其消解半衰期为5.3～11.8d。建立的提取方法准确、可靠。For the sake of exploring the degradation dynamics of herbicide in soil of no-tillage rape with rice stubble, a field experiment was conducted, an extraction and detection method of glyphosate and paraquat in soil was constructed, taking NaHCO3 as the extraction solution and detecting by HPLC with ultraviolet and fluorescence detectors. The results showed that when the adding amount was 0. 5 5.0 mg/kg the fortified recovery rate of glyphosate and paraquat in soil ranged from 76.4% to 96.2G with the variation coefficient of 2.89 % ～7.22%3 The degradation dynamics of glyphosate and paraquat residues was in accordance with exponential regression equation C= AeBt, the half-life period was 5.3 ～ 11.8 d. The established extraction method was accurate and reliable.

关 键 词：草甘膦 百草枯 消解动态 回收率 检测方法 

分 类 号：S565.4[农业科学—作物学] X53[环境科学与工程—环境工程]