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

Phong, Thai Khanh, Hiramatsu, Kazuaki, Vu, Son Hong, Ishihara, Satoru, & Watanabe, Hirozumi (2009) Simulation of pesticide behavior in a paddy block by a pesticide fate and transport model. Journal of the Faculty of Agriculture, 54(2), pp. 505-512.

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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.

Impact and interest:

3 citations in Scopus
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3 citations in Web of Science®

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ID Code: 88997
Item Type: Journal Article
Refereed: Yes
Keywords: PCPF-1, PCPF-B, Pesticide application distribution, Pesticide modeling, Predicted environmental concentration (PEC)
ISSN: 0023-6152
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 14 Oct 2015 03:46
Last Modified: 23 Oct 2015 04:58

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