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This article in JEQ

  1. Vol. 41 No. 2, p. 515-525
    OPEN ACCESS
     
    Received: Feb 26, 2011
    Published: Mar, 2012


    * Corresponding author(s): marc.lamers@uni-hohenheim.de
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doi:10.2134/jeq2011.0066

Fate of Pesticides in Combined Paddy Rice–Fish Pond Farming Systems in Northern Vietnam

  1. Maria Anyushevaa,
  2. Marc Lamers *a,
  3. Nguyen Laa,
  4. Van Vien Nguyenb and
  5. Thilo Strecka
  1. a Biogeophysics Section, Institute of Soil Science and Land Evaluation, University of Hohenheim, Emil–Wolff–Str. 27, 70593 Stuttgart, Germany
    b Institute of Plant Pathology, Hanoi University of Agriculture, Gia Lam Hanoi, Vietnam. Assigned to Associate Editor Pierre Benoit

Abstract

During the last decades, high population growth and export-oriented economics in Vietnam have led to a tremendous intensification of rice production, which in turn has significantly increased the amount of pesticides applied in rice cropping systems. Since pesticides are toxic by design, there is a natural concern on the impact of their presence in the environment on human health and environmental quality. The present study was designed to examine the water regime and fate of pesticides (fenitrothion, dimethoate) during two consecutive rice crop seasons in combined paddy rice–fish pond farming systems in northern Vietnam. Major results revealed that 5 and 41% (dimethoate), and 1 and 17% (fenitrothion) of the applied mass of pesticides were lost from the paddy field to the adjacent fish pond during spring and summer crop seasons, respectively. The decrease of pesticide concentration in paddy surface water was very rapid with dissipation half-life values of 0.3 to 0.8 and 0.2 d for dimethoate and fenitrothion, respectively. Key factors controlling the transport of pesticides were water solubility and paddy water management parameters, such as hydraulic residence time and water holding period. Risk assessment indicates that the exposure to toxic levels of pesticides for aquaculture (Cyprinus carpio, Daphnia magna) is significant, at least shortly after pesticide application.

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Copyright © 2012. Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.

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