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Phosphorus speciation and iron mineralogy in an oxisol after 11 years of pig slurry application.
Abdala, D B; Gatiboni, L C; Schmitt, D E; Mumbach, G L; Dall'Orsoletta, D J; Bonfada, E B; Veiga, M.
Afiliação
  • Abdala DB; Brazilian Synchrotron Light Laboratory, Campinas, São Paulo, Brazil.
  • Gatiboni LC; Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, United States of America.
  • Schmitt DE; Department of Agriculture, Biodiversity and Forests, Federal University of Santa Catarina, Curitibanos, Santa Catarina, Brazil.
  • Mumbach GL; Department of Soil and Natural Resources, University of Santa Catarina State, Lages, Santa Catarina, Brazil.
  • Dall'Orsoletta DJ; Department of Soil Science and Natural Resources, Santa Catarina State University, Lages, Santa Catarina, Brazil. Electronic address: dani.orsoletta@gmail.com.
  • Bonfada EB; MT Fundation - Campo Novo do Parecis, Mato Grosso, Brazil.
  • Veiga M; Western University of Santa Catarina, Campos Novos, Santa Catarina, Brazil.
Sci Total Environ ; 743: 140487, 2020 Nov 15.
Article em En | MEDLINE | ID: mdl-32653703
Application of phosphate fertilizers beyond plants needs favors phosphorus (P) accumulation in soils, which may alter its reactivity and chemical speciation. The objective of this study was to assess the changes in P speciation in a Brazilian oxisol that received consecutive applications of varying rates of pig slurry (PS) over 11 years. The soils were treated with PS at rates of 50, 100 and 200 m3 ha-1 year-1, whereas a control plot received P and potassium (K) to replenish the amounts removed by harvest. The soils were sampled and characterized for its P sorption capacity (PSC) as determined by Langmuir sorption isotherms, P partitioning by sequential chemical fractionation (SCF), P chemical speciation via P K-edge XANES and iron (Fe) mineralogy via Fe K-edge EXAFS spectroscopies. Increases in applied PS rates were accompanied by increases in PSC at the 0 to 2.5 and 0 to 10 cm soil layers. P accumulation was observed to be restricted up to the depth of 20 cm, regardless of the PS rate applied. The P K-edge XANES analysis indicated that P accumulation in the topmost soil layers, occurred predominantly associated with Fe-(hydr)oxide minerals. In this soil layer (0 to 2.5 cm), the organic P pool was of particular importance likely due to no-tillage. A dramatic change in Fe mineralogy in the topmost soil layer was observed across the studied soils, with the predominance of hematite in the reference soil and in the control plot, whereas the occurrence of goethite and ferrihydrite was followed by the application of PS.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fósforo / Ferro Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Sci Total Environ Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fósforo / Ferro Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Sci Total Environ Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda