Degradation of Herbicides Atrazine and Bentazone Applied Alone and in Combination in Soils

LI Ke-Bin; CHENG Jing-Tao; WANG Xiao-Fang; ZHOU Ying; LIU Wei-Ping

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Degradation of Herbicides Atrazine and Bentazone Applied Alone and in Combination in Soils

机译：单独施用和组合施用的除草剂At去津和苯达松的降解

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The application of a mixture of bentazone (3-isopropyl-lH-2,1,3-benzothiadiazin-4(3H)-one-2,2-dioxide) and atrazine (6-chloro-N2-ethyl-N4-isopropy1-1,3,5-triazine-2,4-diamine) is a practical approach to enhance the herbicidal effect.Labo-ratory incubation experiments were performed to study the degradation of bentazone and atrazine applied in combination and individually in maize rhizosphere and non-rhizosphere soils.After a lag phase,the degradation of each individual herbicide in the non-autoclaved soil could be adequately described using a first-order kinetic equation.During a 30-d in-cubation,in the autoclaved rhizosphere soil,bentazone and atrazine did not noticeably degrade,but in the non-autoclaved soil,they rapidly degraded in both non-rhizosphere and rhizosphere soils with half-lives of 19.9 and 20.2 d for bentazone and 29.1 and 25.7 d for atrazine,respectively.The rhizosphere effect significantly enhanced the degradation of atrazine,but had no significant effect on bentazone.These results indicated that biological degradation accounted for the degrada-tion of both herbicides in the soil.When compared with the degradation of the herbicide applied alone,the degradation rates of the herbicides applied in combination in the soils were lower and the lag phase increased.With the addition of a surfactant,Tween-20,a reduced lag phase of degradation was observed for both herbicides applied in combination.The degradation rate of bentazone accelerated,whereas that of atrazine remained nearly unchanged.Thus,when these two herbicides were used simultaneously,their persistence in the soil was generally prolonged,and the environmental contamination potential increased.

机译：苯达松（3-异丙基-1H-2,1,3-苯并噻二嗪-4（3H）-一-2,2-二氧化物）和at去津（6-氯-N2-乙基-N4-异丙基1- 1,3,5-三嗪-2,4-二胺是提高除草效果的实用方法。进行了实验室孵育实验，研究了在玉米根际和非玉米根中联合使用和单独使用的本达松和阿特拉津的降解情况。滞后阶段后，可以使用一阶动力学方程充分描述非高压灭菌土壤中每种除草剂的降解。在孵育30天后，高压灭菌的根际土壤中，bentazone和at去津没有明显降解，但在非高压灭菌的土壤中，它们在非根际和根际土壤中均迅速降解，苯达松的半衰期分别为19.9和20.2 d，阿特拉津的半衰期分别为29.1和25.7 d。阿特拉津的降解，但对苯达松无明显影响。这些结果表明，生物降解是土壤中两种除草剂降解的原因。与单独施用除草剂的降解相比，组合施用在土壤中的除草剂的降解率较低，滞后期增加。加入表面活性剂Tween-20可以降低两种农药组合的降解滞后期。苯达松的降解速率加快，而阿特拉津的降解速率几乎保持不变。因此，这两种除草剂同时使用时，它们在土壤中的持久性通常会延长，环境污染的可能性也会增加。

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《土壤圈（英文版）》 |2008年第2期|265-272|共8页
作者
LI Ke-Bin; CHENG Jing-Tao; WANG Xiao-Fang; ZHOU Ying; LIU Wei-Ping;
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作者单位

Department of Chemistry,Northwest University,Xi'an 710069 (China);

Department of Chemistry,Shaanxi Institute of Education,Xi'an 710061(China);

Department of Chemistry,Northwest University,Xi'an 710069 (China);

Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou 310032(China);

Rescarch Center of Green Chirality,College of Biological and Environmental Engineering,Zhejiang University of Tech-nology,Hangzhou 310032(China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
atrazine,bentazone,degradation,herbicide combination;

机译：阿特拉津;苯他那酮;降解;除草剂组合;

Degradation of Herbicides Atrazine and Bentazone Applied Alone and in Combination in Soils

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