Single and dual-permeability models of chlorotoluron transport in the soil profile
Kodesova, R.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)E-mail:[email protected] | Kozak, J.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Simunek, J.(University of California Riverside (USA)) | Vacek, O.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)
The herbicide Syncuran was applied on a plot (4 square m) using an application rate of 2.5 kg/ha of active ingredient in order to study the transport of chlorotoluron in the soil profile. Soil samples were taken after 119 days. The single and dual-permeability models in HYDRUS-1D were used to simulate water movement and herbicide transport in the soil profile. The adsorption isotherm and the degradation rate were determined in a 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 the observed chlorotoluron concentrations. The chlorotoluron distribution within depth calculated using the dual-permeability model was close to the observed chlorotoluron behaviour. The dual-permeability model significantly improved the correspondence between calculated and observed herbicide concentrations.
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