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Simulating the dissipation of two herbicides using micro paddy lysimeters.

Dang Thi Tuyet Nhung1, Thai Khanh Phong, Hirozumi Watanabe

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Micro paddy lysimeters effectively simulated herbicide dissipation in controlled environments. Results closely matched field data for simetryn and thiobencarb, validating lysimeters for pesticide research.

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Area of Science:

  • Environmental Chemistry
  • Agricultural Science
  • Soil Science

Background:

  • Pesticide dissipation studies are crucial for understanding environmental fate.
  • Simetryn and thiobencarb are commonly used herbicides in paddy fields.
  • Controlled environment simulations can aid in predicting pesticide behavior.

Purpose of the Study:

  • To simulate and evaluate the dissipation of simetryn and thiobencarb in paddy environments using micro paddy lysimeters.
  • To compare simulated herbicide dissipation with field monitoring data under different irrigation scenarios.
  • To assess the suitability of micro paddy lysimeters for pesticide dissipation studies.

Main Methods:

  • Utilized packed micro paddy lysimeters in a greenhouse setting.
  • Simulated herbicide dissipation over 21 days under intermittent irrigation management (AI) and continuous irrigation management (CI) scenarios.
  • Incorporated field monitoring data from 2003, including soil conditions and water balances.

Main Results:

  • Simulated dissipation patterns for simetryn and thiobencarb in surface water closely aligned with field data (P>0.05), except for thiobencarb in the CI scenario.
  • Herbicide distribution in the soil profile showed high concentrations in the topsoil (0-2.5 cm) and minimal leaching to deeper layers, mirroring field observations.
  • Micro paddy lysimeters demonstrated good agreement with field data for both surface water dissipation and soil profile distribution.

Conclusions:

  • Micro paddy lysimeters serve as a reliable alternative for studying pesticide dissipation in paddy ecosystems.
  • The simulation accurately reflected real-world herbicide behavior, supporting the use of controlled lysimeter studies.
  • Understanding herbicide fate in paddy fields is essential for sustainable agricultural practices and environmental protection.