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| Influence of Organic Amendments on Adsorption, Desorption and Leaching of Methiopyrisulfuron in Soils |
| WU Chun-xian, NIE Guo, ZHANG Zhong-ming, WANG Guang-cheng, GAO Li-ming , WANG Jinjun |
1.College of Plant Protection, Southwest University, Chongqing 400716, P.R.China
2.Institute of the Control of Agrochemical of Sichuan Province, Chengdu 610041, P.R.China |
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摘要 Methiopyrisulfuron is a novel sulfonylurea herbicide with good activity for annual broadleaf and gramineal weeds control. Present study was to investigate the effects of organic amendments (including peat (PE), sewage sludge (SS), and humic acid (HA)) on adsorption, desorption and leaching of methiopyrisulfuron in soils. The batch equilibration technique was applied for adsorption-desorption experiments and the leaching was tested through soil column simulated experiments under laboratory conditions. The Freundlich model may well describe adsorption-desorption of methiopyrisulfuron on organic amendments, the natural soil, and amended soils. Organic amendments could not only greatly increase the adsorption capacity of methiopyrisulfuron, but also significantly enhance the hysteresis of desorption of methiopyrisulfuron. The correlations between Kf-ads and organic matter content of amended soils were significant, and the correlations between H and soil organic matter in amended soils with PE, SS, and HA were significant too. The results of soil column experiments indicated that organic amendments greatly decreased leaching of methiopyrisulfuron. This study suggested that PE, SS, and HA could greatly influence environmental behavior of methiopyrisulfuron in soils. Use of organic amendments might be an effective management practice for controlling potential pollution of methiopyrisulfuron to environment.
Abstract Methiopyrisulfuron is a novel sulfonylurea herbicide with good activity for annual broadleaf and gramineal weeds control. Present study was to investigate the effects of organic amendments (including peat (PE), sewage sludge (SS), and humic acid (HA)) on adsorption, desorption and leaching of methiopyrisulfuron in soils. The batch equilibration technique was applied for adsorption-desorption experiments and the leaching was tested through soil column simulated experiments under laboratory conditions. The Freundlich model may well describe adsorption-desorption of methiopyrisulfuron on organic amendments, the natural soil, and amended soils. Organic amendments could not only greatly increase the adsorption capacity of methiopyrisulfuron, but also significantly enhance the hysteresis of desorption of methiopyrisulfuron. The correlations between Kf-ads and organic matter content of amended soils were significant, and the correlations between H and soil organic matter in amended soils with PE, SS, and HA were significant too. The results of soil column experiments indicated that organic amendments greatly decreased leaching of methiopyrisulfuron. This study suggested that PE, SS, and HA could greatly influence environmental behavior of methiopyrisulfuron in soils. Use of organic amendments might be an effective management practice for controlling potential pollution of methiopyrisulfuron to environment.
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Received: 15 November 2012
Accepted:
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Corresponding Authors:
Correspondence WANG Jin-jun, Tel: +86-23-68250255, Fax: +86-23-68251269, E-mail: jjwang7008@yahoo.com
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| About author: WU Chun-xian, E-mail: wchx74120@163.com |
Cite this article:
WU Chun-xian, NIE Guo, ZHANG Zhong-ming, WANG Guang-cheng, GAO Li-ming , WANG Jinjun.
2013.
Influence of Organic Amendments on Adsorption, Desorption and Leaching of Methiopyrisulfuron in Soils. Journal of Integrative Agriculture, 12(9): 1589-1597.
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