Abstract
The fate and transport of tricyclazole and imidacloprid in paddy plots after nursery-box application was monitored. Water and surface soil samples were collected over a period of 35 days. Rates of dissipation from paddy waters and soils were also measured. Dissipation of the two pesticides from paddy water can be described by first-order kinetics. In the soil, only the dissipation of imidacloprid fitted to the simple first-order kinetics, whereas tricyclazole concentrations fluctuated until the end of the monitoring period. Mean half-life (DT50) values for tricyclazole were 11.8 and 305 days, respectively, in paddy water and surface soil. The corresponding values of imidacloprid were 2.0 and 12.5 days, respectively, in water and in surface soil. Less than 0.9% of tricyclazole and 0.1% of imidacloprid were lost through runoff during the monitoring period even under 6.3 cm of rainfall. The pesticide formulation seemed to affect the environmental fate of these pesticides when these results were compared to those of other studies.
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Acknowledgments
Special thanks to Kumiai Chemical Industry for supplying the BEAM admire product. We are also indebted to Dr. H. S. Vu, Mr. T. Q. Hien, and Mr. T. Tanaka at TUAT for the field work and to Dr. K. Takagi and Mr. K. Yamazaki at the National Institute for Agro-Environmental Sciences for the technical advice on pesticide analysis.
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Phong, T.K., Nhung, D.T.T., Motobayashi, T. et al. Fate and Transport of Nursery-Box-Applied Tricyclazole and Imidacloprid in Paddy Fields. Water Air Soil Pollut 202, 3–12 (2009). https://doi.org/10.1007/s11270-008-9953-z
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DOI: https://doi.org/10.1007/s11270-008-9953-z