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Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight
Ok, Junghun,Watanabe, Hirozumi,Cho, Junglai,An, Nanhee,Lee, Byungmo The Korean Society of Environmental Agriculture 2014 한국환경농학회지 Vol.33 No.2
BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuron-ethyl in paddy water under natural sunlight. METHODS AND RESULTS: The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuron-ethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from $355.3{\mu}g/L$ to $37.8{\mu}g/L$ and from $10.5{\mu}g/L$ to $3.9{\mu}g/L$, respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy water decreased quickly under ambient conditions with natural sunlight. The degradation of butachlor in paddy water was enhanced by the natural sunlight. However, the degradation of pyrazosulfuron-ethyl was insignificant under natural sunlight.
Effect of rice husk gasification residue application on herbicide behavior in micro paddy lysimeter.
Ok, Junghun,Pisith, Sok,Watanabe, Hirozumi,Thuyet, Dang Quoc,Boulange, Julien,Takagi, Kazuhiro Springer Verlag 2015 Bulletin of environmental contamination and toxico Vol.94 No.6
<P>Effects of rice husk gasification residues (RHGR) application on the fate of herbicides, butachlor and pyrazosulfuron-ethyl, in paddy water were investigated using micro paddy lysimeters (MPLs). The dissipation of both herbicides in paddy water was faster in the RHGR treated MPL than in the control MPL. The average concentrations of butachlor and pyrazosulfuron-ethyl in paddy water in the lysimeter treated with RHGR during 21 days were significantly reduced by 51% and 48%, respectively, as compared to those in the lysimeter without RHGR application. The half-lives (DT50) of butachlor in paddy water for control and treatment were 3.1 and 2.3 days respectively, and these values of pyrazosulfuron-ethyl were 3.0 and 2.2 days, respectively. Based on this study, RHGR application in rice paddy environment is an alternative method to reduce the concentration of herbicide in paddy field water and consequently to reduce potential pollution to aquatic environment.</P>
( Jung Hun Ok ),( Hirozumi Watanabe ),( Jung Lai Cho ),( Nan Hee An ),( Byung Mo Lee ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.2
BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuron- ethyl in paddy water under natural sunlight. METHODS AND RESULTS: The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuron- ethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from 355.3 μg/L to 37.8 μg/L and from 10.5 μg/L to 3.9 μg/L, respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy water decreased quickly under ambient conditions with natural sunlight. The degradation of butachlor in paddy water was enhanced by the natural sunlight. However, the degradation of pyrazosulfuron-ethyl was insignificant under natural sunlight.
벼 2기작에서 작물재배시기에 따른 제초제의 유출특성 모니터링
옥정훈 ( Junghun Ok ),뉴엔하이도안 ( Nguyen Hai Doan ),와타나베히로즈미 ( Hirozumi Watanabe ),당궉듀엣 ( Dang Quoc Thuyet ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
아열대 기후 등에서 이루어지고 있는 벼 2기작재배에서 비점오염원인 농약의 유출특성을 파악하기 위하여, 논에서 봄과 여름의 작물재배시기에 따라 두 제초제 butachlor와 pyrazosulfuron-ethyl의 농약유출특성을 온도변화에 따라 조사하였다. 주요 목적을 수행하기 위하여 세부적인 연구항목으로 실제 논 환경에서 작물재배시기에 따른 두 제초제의 농약유출특성 모니터링, 소형 라이시메타를 이용하여 인위적인 수문조건조절에서 작물재배시기의 온도 차이에 따른 두 제초제의 농약유출특성 모니터링, 온도 변화 및 자연광에 의한 두 제초제의 저감과정 실험 등을 수행하였다. 그 결과를 요약하면 다음과 같다. 실제 논 환경에서의 모니터링을 2년동안 수행하여 논에서의 물과 토양내의 두 제초제의 농도변화를 비교ㆍ분석했다. 현장 실험에서는 강우이벤트가 제초제 농도 및 손실에 주요한 영향 요인으로 작용하였다. 이에 따라, 실제 논에서 봄과 여름동안 농약유출특성에 대한 온도의 영향은 여러 환경요인으로 인하여 그 영향을 평가하는 것이 어려웠다. 온도에 따른 두 제초제의 농약유출특성을 명확히 평가하기 위하여 소형 라이시메타를 이용하여 인위적으로 수문조건을 컨트롤하여 봄과 여름작물재배시기 동안에 두 제초제의 온도 변화에 따른 영향을 알아보았다. 소형 라이시메타 실험에서는 여름에서 물 샘플에서의 두 제초제의 손실이 봄과 비교하여 보다 빠르게 일어났으며, 물 샘플에 두 제초제의 주요 손실은 온도차이에 의한 저감속도 차이에 의해서 이루어진 것으로 판단된다. 물 샘플에서의 두 제초제의 저감 과정을 여러 온도 조건 및 자연광 등에서 실험을 통하여 알아보았다. 그 결과로, 이 두 제초제에 대한 저감과정의 기여도는 온도 및 자연광 등에 따라 각각 다르게 영향을 받았다. 물 샘플에서 pyrazosulfuron-ethyl의 저감 속도는 온도의 증가에 의해 증가되었든 반면, butachlor경우에는 자연광에 의한 저감이 뚜렷하게 발생하는 것을 확인할 수 있었다.