Pesticide discharge and water management in a paddy catchment in Japan

Phong, Thai Khanh, Yoshino, Katsunori, Hiramatsu, Kazuaki, Harada, Masayoshi, & Inoue, Tsuyoshi (2010) Pesticide discharge and water management in a paddy catchment in Japan. Paddy and Water Environment, 8(4), pp. 361-369.

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Concentrations of several pesticides were monitored in a paddy block and in the Kose river, which drains a paddy catchment in Fukuoka prefecture, Japan. Detailed water management in the block was also monitored to evaluate its effect on the pesticide contamination. The concentrations of applied pesticides in both block irrigation channel and drainage canal increased to tens of μg/L shortly after their applications. The increase in pesticide concentrations was well correlated with the open of irrigation and drainage gates in the pesticide-applied paddy plots only 1–3 days after pesticide application. High concentration of other pesticides, mainly herbicides, was also observed in the inflow irrigation and drainage waters, confirming the popularity of early irrigation and drainage after pesticide application in the area. The requirement of holding water after pesticide application (as a best management practice) issued by the authority was thus not properly followed. In a larger scale of the paddy catchment, the concentration of pesticides also increased significantly to several μg/L in the water of the Kose river shortly after the start of the pesticide application period either in downstream or mid–upstream areas, confirming the effect of current water management to the water quality. More extension and enforcement on water management should be done in order to control pesticide pollution from rice cultivation in Japan.

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12 citations in Scopus
13 citations in Web of Science®
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ID Code: 89002
Item Type: Journal Article
Refereed: Yes
Keywords: Rice pesticide, Paddy block, Drainage canal, Irrigation channel, Pesticide concentration
DOI: 10.1007/s10333-010-0215-5
ISSN: 1611-2490
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 14 Oct 2015 04:26
Last Modified: 26 Jun 2017 00:01

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