Hydraulic conductivity in response to exchangeable sodium percentage and solution salt concentration

Revista Ceres

Jefferson Luiz De Aguiar Paes²  Hugo Alberto Ruiz¹  Raphael Bragança Alves Fernandes¹  Maria Betânia Galvão Dos Santos Freire¹  Maria De Fatima Cavalcanti Barros¹  Genelício Crusóe Rocha¹ 

[1] ,Instituto Federal de RoraimaCaracaraí Roraima ,Brasil

关键词: saline soils;    saline-sodic soils;    exchangeable-sodium-percentage;    soil solution electrical conductivity;    solos salinos;    solos salino-sódicos;    percentagem de sódio trocável;    condutividade elétrica da solução do solo;    extrato da pasta de saturação;   

DOI  :  10.1590/0034-737X201461050015

来源: SciELO

【 摘 要 】

Hydraulic conductivity is determined in laboratory assays to estimate the flow of water in saturated soils. However, the results of this analysis, when using distilled or deionized water, may not correspond to field conditions in soils with high concentrations of soluble salts. This study therefore set out to determine the hydraulic conductivity in laboratory conditions using solutions of different electrical conductivities in six soils representative of the State of Pernambuco, with the exchangeable sodium percentage adjusted in the range of 5-30%. The results showed an increase in hydraulic conductivity with both decreasing exchangeable sodium percentage and increasing electrical conductivity in the solution. The response to the treatments was more pronounced in soils with higher proportion of more active clays. Determination of hydraulic conductivity in laboratory is routinely performed with deionized or distilled water. However, in salt affected soils, these determinations should be carried out using solutions of electrical conductivity different from 0 dS m-1, with values close to those determined in the saturation extracts.

【 授权许可】

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