Simulation of pesticide behavior in a paddy block by a pesticide fate and transport model

Thai Khanh Phong, Kazuaki Hiramatsu, Son Hong Vu, Satoru Ishihara, Hirozumi Watanabe

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5 Citations (Scopus)


A simulation model (PCPF-B) was developed based on the PCPF-1 model to predict the runoff of pesticides from paddy plots to a drainage canal in a paddy block. The block-scale model now comprises three modules: (1) a module for pesticide application, (2) a module for pesticide behavior in paddy fields, and (3) a module for pesticide concentration in the drainage canal. The PCPF-B model was first evaluated by published data in a single plot and then was applied to predict the concentration of bensulfuron-methyl in one paddy block in the Sakura river basin, Ibaraki, Japan, where a detailed field survey was conducted. The PCPF-B model simulated well the behavior of bensulfuron-methyl in individual paddy plots. It also reflected the runoff pattern of bensulfuron-methyl at the block outlet, although overestimation of bensulfuronmethyl concentrations occurred due to uncertainty in water balance estimation. Application of water management practice such as water-holding period and seepage control also affected the performance of the model. A probabilistic approach may be necessary for a comprehensive risk assessment in large-scale paddy areas.

Original languageEnglish
Pages (from-to)505-512
Number of pages8
JournalJournal of the Faculty of Agriculture, Kyushu University
Issue number2
Publication statusPublished - Oct 2009

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science


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