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Single and dual-permeability models of chlorotoluron transport in the soil profile

Author

Listed:
  • R. Kodešová

    (Czech University of Agriculture in Prague, Czech Republic)

  • J. Kozák

    (Czech University of Agriculture in Prague, Czech Republic)

  • J. Šimůnek

    (University of California Riverside, CA, USA)

  • O. Vacek

    (Czech University of Agriculture in Prague, Czech Republic)

Abstract

This study presents the transport of chlorotoluron in the soil profile under field conditions. The herbicide Syncuran was applied on a plot (4 m˛) using an application rate of 2.5 kg/ha of active ingredient. Soil samples were taken after 119 days to study the residual chlorotoluron distribution in the soil profile. The single and dual-permeability models in HYDRUS-1D (Šimůnek et al. 2003) were used to simulate water movement and herbicide transport in the soil profile. Soil hydraulic properties and their variability were previously studied by Kutílek et al. (1989). The solute transport parameters, such as the adsorption isotherm and the degradation rate, were determined in the laboratory. Since the solute transport in the field was probably affected by preferential flow, the chlorotoluron distribution in the soil profile calculated using the single-permeability model had a different character than observed chlorotoluron concentrations. The chlorotoluron distribution within depth calculated using the dual-permeability model was closer to the observed behavior of chlorotoluron. While the herbicide did not reach a depth of 8 cm for the single-porosity system, in the case of the dual-permeability model the solute moved to the depth of 60 cm. The dual-permeability model significantly improved correspondence between calculated and observed herbicide concentrations.

Suggested Citation

  • R. Kodešová & J. Kozák & J. Šimůnek & O. Vacek, 2005. "Single and dual-permeability models of chlorotoluron transport in the soil profile," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 51(7), pages 310-315.
    • Handle: RePEc:caa:jnlpse:v:51:y:2005:i:7:id:3591-pse
    DOI: 10.17221/3591-PSE
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    Citations

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    Cited by:

    1. M. Kočárek & R. Kodešová & J. Kozák & O. Drábek & O. Vacek, 2005. "Chlortoluron behavior in five different soil types," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 51(7), pages 304-309.
    2. E. Hiller & M. Khun & L. Zemanová & Ľ. Jurkovič & M. Bartaľ, 2006. "Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 52(12), pages 550-558.

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