Sugarcane straw management and soil attributes on alachlor and diuron sorption in highly weathered tropical soils |
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Authors: | Fabrício Garcia Giori Valdemar Luiz Tornisielo Carlos Eduardo Pellegrino Cerri Jussara Borges Regitano |
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Institution: | 1. Department of Soil Science, College of Agriculture “Luiz de Queiroz” , University of S?o Paulo—ESALQ/USP , Piracicaba , Brazil;2. Ecotoxicology Laboratory, Center for Nuclear Energy in Agriculture , University of S?o Paulo—CENA/USP , Piracicaba , Brazil |
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Abstract: | This research evaluated the effects of the new sugarcane harvesting system (without straw burning) and soil attributes on the organic carbon (OC) accumulation and sorption of alachlor (2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide) and diuron (3-(3,4-dichlorophenyl)-1,1-dimethylurea) in highly weathered Brazilian soils. Alachlor was more likely to leach (K d,app = 1.0–7.0 L kg?1 and mean K oc,app = 174 L kg?1) than diuron (K d,app = 6.2–116.3 L kg?1 and mean K oc,app = 1789 L kg?1). The sorption coefficient (K d,app) values correlated better with soil OC contents, but the Fe-oxides also played an important role in these highly weathered soils. Sorption was enhanced in the areas without straw burning mostly due to OC accumulation that was higher in the clayey soils, but it was not enough to change their mobility classification. |
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Keywords: | Herbicide transport leaching weathered soils harvesting systems |
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