Sugarcane straw management and soil attributes on alachlor and diuron sorption in highly weathered tropical soils

Author(s)

Giori, Fabricio Garcia ^[1] ; Tornisielo, Valdemar Luiz ^[2] ; Pellegrino Cerri, Carlos Eduardo ^[1] ; Regitano, Jussara Borges ^[1]

Affiliation

^[1] Univ Sao Paulo ESALQ USP, Dept Soil Sci, Coll Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo CENA USP, Ecotoxicol Lab, Ctr Nucl Energy Agr, BR-13418900 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMIN; v. 49, n. 5, p. 352-360, MAY 4 2014.
• Web of Science Citations: 6

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. (AU)

• FAPESP's process: 12/15843-0 - Harvesting systems (with and without residue burning) on the sorption and desorption of herbicides in sugar cane
• Grantee: Jussara Borges Regitano
• Support Opportunities: Regular Research Grants