The mobility of thiobencarb and fipronil in two flooded rice-growing soils |
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Authors: | Doran Gregory Eberbach Philip Helliwell Stuart |
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Institution: | Cooperative Research Centre for Sustainable Rice Production, Charles Sturt University, Wagga Wagga, Australia. gdoran@csu.edu.au |
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Abstract: | The mobility of the rice pesticides thiobencarb (S-(4-chlorophenyl) methyl] diethylcarbamothioate) and fipronil (5-amino-3-cyano-1-2,6-dichloro-4-(trifluoromethyl)phenyl]-4-(trifluoromethyl)sulfinyl]pyrazole) were investigated in the glasshouse under flooded conditions using two Australian rice-growing soils. When using leakage rates of 10 mm day(-1), less than 20% of applied thiobencarb and fipronil remained in the water column after 10 days due to rapid transfer to the soil phase. Up to 70% and 65% of the applied thiobencarb and fipronil, respectively, were recovered from the 0-1 cm layer of soils. Only 5-7% of each pesticide was recovered from the 1-2 cm layer, and less than 2% was recovered from each 1 cm layer in the 2-10 cm region of the soils. Analysis of the water leaking from the base of the soil cores showed between 5-10% of the applied thiobencarb and between 10-20% of the applied fipronil leaching from the soil cores. The high levels of pesticide in the effluent was attributed to preferential flow of pesticide-laden water via soil macropores resulting from the wetting and drying process, worm holes and root channels. |
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