Probabilistic assessment of herbicide runoff from Japanese rice paddies: The effects of local meteorological conditions and site-specific water management

Kei Kondo, Julien Boulange, Thai Khanh Phong, Kazuaki Hiramatsu, Tsuyoshi Inoue, Hirozumi Watanabe

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Uncertainty assessments of herbicide losses from rice paddies in Japan associated with local meteorological conditions and water management practices were performed using a pesticide fate and transport model, PCPF-1, under the Monte Carlo (MC) simulation scheme. First, MC simulations were conducted for five different cities with a prescribed water management scenario and a 10-year meteorological dataset of each city. The effectiveness of water management was observed regarding the reduction of pesticide runoff. However, a greater potential of pesticide runoff remained in Western Japan. Secondly, an extended analysis was attempted to evaluate the effects of local water management and meteorological conditions between the Chikugo River basin and the Sakura River basin using uncertainty inputs processed from observed water management data. The results showed that because of more severe rainfall events, significant pesticide runoff occurred in the Chikugo River basin even when appropriate irrigation practices were implemented.

Original languageEnglish
Pages (from-to)312-322
Number of pages11
JournalJournal of Pesticide Science
Issue number4
Publication statusPublished - Dec 1 2012


All Science Journal Classification (ASJC) codes

  • Insect Science
  • Health, Toxicology and Mutagenesis

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