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Behavior of Herbicide Pyrazolynate and its Hydrolysate in Paddy Fields after Application

Abstract

Behavior of the herbicide pyrazolynate, 4-(2,4-dichlorobenzoyl)-1,3-dimethylpyrazol-5-yl p-toluenesulfonate, in paddy water and soil after application to paddy fields was investigated to evaluate the hydrolyzation to destosyl pyrazolynate (DTP), 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-hydroxypyrazole. The respective maximum concentrations of pyrazolynate and DTP were 440–1,240 and 200–260 μg/L, respectively, in the paddy water, and 610–860 μg/kg dry and 460–730 μg/kg dry in the paddy soil. The applied pyrazolynate was drained from the paddy fields as DTP. The runoff ratios of DTP from the paddy fields were calculated as 19 % ± 14 %. The respective mean values of the half-lives of pyrazolynate and DTP were 0.87 ± 0.091 and 17 ± 1.4 days in the paddy water and 2.2 ± 0.70 and 26 ± 2.1 days in the paddy soil, respectively.

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Correspondence to Kuniaki Kawata.

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Kubo, T., Ohno, M., Nagasawa, S. et al. Behavior of Herbicide Pyrazolynate and its Hydrolysate in Paddy Fields after Application. Bull Environ Contam Toxicol 89, 985–989 (2012). https://doi.org/10.1007/s00128-012-0793-6

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Keywords

  • Herbicide
  • Pyrazolate
  • Hydrolysate
  • Paddy water
  • Paddy soil
  • Runoff
  • Half-life