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Title

Sorption-Desorption of Alachlor and Linuron in a Semiarid Soil As Influenced by Organic Matter Properties after 16 Years of Periodic Inputs

AuthorsDorado, José CSIC ORCID ; López-Fando, Cristina CSIC ; Zancada Fernández, M. Cristina  ; Almendros Martín, Gonzalo CSIC ORCID
KeywordsHerbicides
Organic matter
Humic acid
Regression models
Issue Date2005
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry (53): 5359-5365 (2005)
AbstractThe effect of management practices on soil potential for regulating the residual concentration of pesticides was examined in samples from a Calcic Haploxeralf in Toledo (central Spain). Sorptiondesorption of alachlor and linuron was found to depend on inputs of lignocelullosic wastes or cattle manure for the past 16 years. For a given herbicide, the soil sorption capacity (K f) follows the order control < crop residues < manure, which is consistent with the organic C content in the soil samples. Some structural characteristics of the soil humic acid as revealed by visible and infrared spectroscopies and analytical pyrolysis were useful to forecast the sorption-desorption intensity. Simple and multiple linear correlation analyses illustrate enhanced sorption of alachlor and linuron in soil plots where slightly altered soil organic matter accumulated (positive correlations with the intensity of infrared lignin signature band and with the methoxyphenol yields after pyrolysis of the humic acids and negative correlation with the aromaticity as pointed out by the optical density at 465 nm). Linuron showed a preference for soils with humic acids of low molecular weight and low degree of internal cross-linking, as inferred from the positive correlation with the ratio between optical densities at 465 and 665 nm. Under the conditions of the present experiment, agricultural practices including organic amendments seem to have a beneficial effect in the control of leaching and sorption of pesticides.
Description6 pages, figures, and tables statistics.
Publisher version (URL)http://dx.doi.org/10.1021/jf047806t
URIhttp://hdl.handle.net/10261/25227
DOI10.1021/jf047806t
ISSN0021-8561
Appears in Collections:(CCMA) Artículos

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