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Provedor de dados:  Rev. Bras. Ciênc. Solo
País:  Brazil
Título:  Chemical properties and mineralogy of soils with plinthite and petroplinthite in Iranduba (AM), Brazil
Autores:  Garcia,Cira Hortensia Pérez
Lima,Hedinaldo Narciso
Silva,Francisco Weliton Rocha
Neves Junior,Afrânio Ferreira
Teixeira,Wenceslau Geraldes
Macedo,Rodrigo Santana
Tavares,Sérgio Guimarães
Data:  2013-08-01
Ano:  2013
Palavras-chave:  Plinthosol
Soil fertility
XRD
Weathering degree
Central Amazon
Resumo:  Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are fairly common in the Brazilian Amazon basin. This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM (Central Amazon). Three well-drained soil profiles at high elevations were studied (P1, Plinthic Vetic Ferralsol; P2 and P3, Vetic Endopetric Plinthosol) and a contrasting poorly drained soil (P4 Haplic Plinthosol), located at low elevation. After profile descriptions, soil samples were collected from each horizon, air-dried, sieved (2 mm), and analyzed for particle-size distribution, pH, exchangeable cations (Al3+, Ca2+, Mg2+, K+, and Na+), as well as available P and total organic carbon (TOC) content. The minerals present in the clay and sand fractions, as well as in the ferruginous materials were identified by X-ray Diffraction (XRD). The weathering stage of these soils was assessed by means of Ki and Kr indexes, and the amounts of free and amorphous Fe and Al oxides by using dithionite citrate bicarbonate (DBC) and ammonium oxalate dissolution procedures, respectively. The results showed that all soils were extremely unfertile, with pH levels ranging between strong and moderate acidity, very low sum of bases and organic matter content, and of available P. The mineralogy of the soil profiles was very similar, mainly of the well-drained soils, with predominance of kaolinite and quartz in the clay and sand fractions, respectively. In the poorly-drained P4, 2:1 clay particles were also observed. These profiles can be considered highly developed according to the Ki index, however, the Ki value of P4 was higher, indicating that this soil was less developed than the others. In summary, these profiles with plinthite and petroplinthite can be characterized as highly developed and infertile soils and are, with exception of P4, well-drained.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400011
Editor:  Sociedade Brasileira de Ciência do Solo
Relação:  10.1590/S0100-06832013000400011
Formato:  text/html
Fonte:  Revista Brasileira de Ciência do Solo v.37 n.4 2013
Direitos:  info:eu-repo/semantics/openAccess
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