A simulation model for predicting pesticide concentrations in paddy water and surface soil II. Model validation and application

作者：Watanabe H^*; Takagi K

来源：Environmental Technology, 2000, 21(12): 1393-1404.

DOI：10.1080/09593332208618169

• simulation model
• paddy field
• pretilachlor
• dissipation
• monitoring

A simulation model for predicting pesticide concentrations in paddy water and surface soil (PCPF-1) was validated with the result of field monitoring data of pretilachlor dissipation in experimental paddy rice field at National institute of Agro-Environmental Sciences (NIAES), Ibaraki, Japan in 1998. Parameter values were determined from laboratory and field experiments. Environmental conditions and pesticide concentrations in experimental rice paddy plot at NIAES were monitored after the herbicide application for 52 days in 1998. Pesticide concentrations in paddy water and 1cm deep surface paddy soil sampled at 1, 3, 7. 14, 21, 28, 35 (water only), 42 and 49 days after the herbicide application were measured using gas chromatography with nitrogen/phosphorus detector (NPD-GC). The PCPF-1 model successfully simulated the drastic decline of pretilachlor concentrations in paddy water during the first week. Although the prediction of pesticide concentrations in paddy water during the mid-period of the simulation was over estimated, PCPF-1 prediction had good agreement with observed data of pretilachlor concentrations both in paddy water and surface soil for the first 10 days and last 20 days of simulation. For the pretilachlor dissipation in paddy field, pesticide desorption from paddy soil to paddy water was the key process controlling the rate of the pesticide dissipation. PCPF-1 has potential to be a beneficial tool for investigating the pesticide fate and transport processes as well as for controlling pesticide transport from the paddy field that affecting the both surface and ground water.

• 出版日期2000-12