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metadata.artigo.dc.title: Electrical conductivity and chemical composition of soil solution: comparison of solution samplers in tropical soils
metadata.artigo.dc.creator: Carmo, Davi Lopes do
Silva, Carlos Alberto
Lima, José Maria de
Pinheiro, Gabriela Lúcia
metadata.artigo.dc.subject: Electrical conductivity
Water soluble carbon
Soil liquid phase
Soil solution extraction methods
Condutividade elétrica
Carbono solúvel em água
Fase líquida do solo
Métodos de extração de solução do solo
metadata.artigo.dc.publisher: Sociedade Brasileira de Ciência do Solo 2016
metadata.artigo.dc.identifier.citation: CARMO, D. L. do et al. Electrical conductivity and chemical composition of soil solution: comparison of solution samplers in tropical soils. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 40, p. 1-17, 2016. doi:
metadata.artigo.dc.description.abstract: Soil solution samplers may have the same working principle, but they differ in relation to chemical and physical characteristics, cost and handling, and these aspects exert influence on the chemical composition of the soil solution obtained. This study was carried out to evaluate, over time, the chemical composition of solutions extracted by Suolo Acqua, with the hydrophilic membrane (HM) as a standard, using soils with contrasting characteristics, and to determine the relationship between electrical conductivity (EC) and concentration of ions and pH of soil solution samples. This study was carried out under laboratory conditions, using three soils samples with different clay and organic matter (OM) contents. Soil solution contents of F−, Cl−, NO−3, Br−, SO42−, Na+, NH4+, K+, Mg2+, Ca2+, were analyzed, as well as inorganic, organic, and total C contents, pH, and EC, in four successive sampling times. Soil solution chemical composition extracted by the Suolo Acqua sampler is similar to that collected by the HM, but the Suolo Acqua extracted more Na+ and soluble organic C than the HM solution. Solution EC, cation and anion concentrations, and soluble C levels are higher in the soil with greater clay and OM contents (Latossolo and Cambissolo in this case). Soil solution composition varied over time, with considerable changes in pH, EC, and nutrient concentrations, especially associated with soil OM. Thus, single and isolated sampling of the soil solution must be avoided, otherwise composition of the soil solution may not be correctly evaluated. Soil solution EC was regulated by pH, as well as the sum of cation and anion concentrations, and the C contents determined in the soil liquid phase.
metadata.artigo.dc.language: en_US
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