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dc.contributor.authorInda Junior, Alberto Vasconcellospt_BR
dc.contributor.authorTorrent, Josépt_BR
dc.contributor.authorBarrón, Vidalpt_BR
dc.contributor.authorBayer, Cimeliopt_BR
dc.contributor.authorFink, Jessé Rodrigopt_BR
dc.date.accessioned2014-08-08T02:07:19Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn0103-9016pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/99306pt_BR
dc.description.abstractReplacing conventional tillage (CT) with no-tillage (NT) management alters the pedoenvironment and the rate of topsoil processes, with possible effects on dissolution processes associated with iron oxides and therefore soil mineralogy. This study aimed to determine the effect of NT on the content and distribution of types of iron oxides in a Rhodic Paleudult in southern Brazil. Soil samples were collected at eight depths within the 0.00-0.80 m layer under CT and NT in a long-term experiment (21 years). Mineralogical identification was conducted by X-ray diffraction (XRD), and the Fe content related to specific types of iron oxides determined by selective dissolution and diffuse-reflectance spectroscopy. Kaolinite, quartz, goethite, hematite, and maghemite were identified in the clay fraction. In the NT-managed soil, there was a decrease in the content of crystalline iron oxides and an increase in the content of poorly crystalline iron oxides with increasing proximity to the soil surface. These results suggest that iron oxides are rearranged in this soil by reductive dissolution of the crystalline types and neoformation of metastable ferrihydrite in topsoil layers, which should be assessed further in laboratory studies.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofScientia Agricola. Piracicaba. Vol. 70, n. 1 (jan./fev. 2013), p. 48-54pt_BR
dc.rightsOpen Accessen
dc.subjectQuímica do solopt_BR
dc.subjectDissolutionen
dc.subjectFerrihydriteen
dc.subjectPlantio convencionalpt_BR
dc.subjectÓxido de ferropt_BR
dc.subjectHematiteen
dc.subjectMaghemiteen
dc.subjectSoil managementen
dc.titleIron oxides dynamics in a subtropical Brazilian Paleudult under long-term no-tillage managementpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000918429pt_BR
dc.type.originNacionalpt_BR


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