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Behavior of Butachlor and Pyrazosulfuron-ethyl in Paddy Water Using Micro Paddy Lysimeters under Different Temperature Conditions in Spring and Summer


The behavior of butachlor and pyrazosulfuron-ethyl in paddy water was investigated using micro paddy lysimeters with prescribed hydrological conditions under ambient temperature in spring and summer for simulating two rice crop seasons. Although they were not significantly different, the dissipation of both herbicides in paddy water in the summer experiment was faster than in the spring experiment. The half-lives (DT50) in paddy water for spring and summer experiments were 3.2 and 2.5 days for butachlor, and 3.1 and 1.6 days for pyrazosulfuron-ethyl, respectively.

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This research was partially supported by the Japan-Taiwan Research Program (2008 and 2009) of Interchange Association, and a Japan and Nissin Sugar Manufacturing Fellowship (0160604403). Special Thanks to Dr. Wang Ching-Yuh and Ms. Wang Zhi-pin at National Chung-Hshing University, Taiwan for providing local temperature data. Also special thanks to Dr. Yutaro Senga for technical advice.

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Correspondence to Hirozumi Watanabe.

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Ok, J., Doan, N.H., Watanabe, H. et al. Behavior of Butachlor and Pyrazosulfuron-ethyl in Paddy Water Using Micro Paddy Lysimeters under Different Temperature Conditions in Spring and Summer. Bull Environ Contam Toxicol 89, 306–311 (2012).

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  • Temperature
  • Butachlor
  • Pyrazosulfuron-ethyl
  • Micro paddy lysimeter