Adsorption and desorption variability of four herbicides used in paddy rice production

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dc.contributor.authorAlister, Claudio A.
dc.contributor.authorAraya, Manuel A.
dc.contributor.authorKogan, Marcelo
dc.date.accessioned2022-11-17T12:31:31Z
dc.date.available2022-11-17T12:31:31Z
dc.date.issued2011-01
dc.description.abstractThis investigation was performed to determine the effect of physicochemical soil properties on penoxsulam, molinate, bentazon, and MCPA adsorption-desorption processes. Four soils from Melozal (35° 43' S; 71° 41' W), Parral (36° 08' S; 71° 52' W), San Carlos (36° 24' S; 71° 57' W), and Panimavida (35° 44' S; 71° 24' W) were utilized. Herbicide adsorption reached equilibrium after 4 h in all soils. The Freundlich L-type isotherm described the adsorption process, which showed a high affinity between herbicides and sorption sites mainly because of hydrophobic and H-bonds interaction. Penoxsulam showed the highest adsorption coefficients (4.23 ± 0.72 to 10.69 ± 1.58 mL g⁻¹) and were related to soil pH. Molinate showed K(d) values between 1.72 ± 0.01 and 2.3 ± 0.01 mL g⁻¹ and were related to soil pH and organic matter, specifically to the amount of humic substances. Bentazon had a high relationship with pH and humic substances and its K(d) values were the lowest, ranging from 0.11 ± 0.01 to 0.42 ± 0.01 mL g⁻¹. MCPA K(d) ranged from 0.14 ± 0.02 to 2.72 ± 0.01 mL g⁻¹, however its adsorption was related to humic acids and clay content. According to these results, the soil factors that could explain the sorption process of the studied herbicides under paddy rice soil conditions, were principally humic substances and soil pH. Considering the sorption variability observed in this study and the potential risk for groundwater contamination, it is necessary to develop weed rice management strategies that limit use of herbicides that exhibit low soil adsorption in areas with predisposing conditions to soil leaching.es_ES
dc.identifier.issn0360-1234
dc.identifier.urihttps://hdl.handle.net/20.500.12536/1870
dc.language.isoeses_ES
dc.sourceJournal of Environmental Science and Healthes_ES
dc.subjectAdsorptiones_ES
dc.subjectDesorptiones_ES
dc.subjectIsothermses_ES
dc.subjectFreundliches_ES
dc.titleAdsorption and desorption variability of four herbicides used in paddy rice productiones_ES
dc.typeArtículo de revistaes_ES
uvm.carreraAgronomíaes_ES
uvm.escuelaEscuela de Ciencias Agrícolas y Veterinariases_ES
uvm.indexWoSes_ES
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