Data/hora: 09/06/2024 16:34:35

Provedor de dados: | 42
País: | Brazil
Título: | Chemical migration during soil water retention curve evaluation
Autores: | Pires,Luiz F.; Villanueva,Felipe C.A.; Dias,Nivea M.P.; Bacchi,Osny O. Santos; Reichardt,Klaus.
Data: | 2011-09-01
Ano: | 2011
Palavras-chave: | Analytical methods; Soil structure; Wetting-drying cycles; Soil physics.
Resumo: | Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca2+, Mg2+ and K+ on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca2+, Mg2+ and K+ during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when samples submitted to the application of several W-D cycles were compared with samples not submitted to it. These differences occurred at the region of both structural and textural pores. A possible explanation for these results could be the soil chemical migration during the sequences of W-D cycles, which can affect the soil structure development.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300028
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652011005000032
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.83 n.3 2011
Fonte: | info:eu-repo/semantics/openAccess