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Revista Brasileira de Engenharia Agrícola e Ambiental

versão On-line ISSN 1807-1929

Resumo

MATOS, Antonio T. de; ALMEIDA NETO, Onofre B.  e  MATOS, Mateus P. de. Saturation of the exchange complex of oxidic soils with sodium. Rev. bras. eng. agríc. ambient. [online]. 2014, vol.18, n.5, pp.501-506. ISSN 1807-1929.  http://dx.doi.org/10.1590/S1415-43662014000500006.

This study investigated the influence of physical, chemical and mineralogical properties of three oxidic soils in their potential sodification. In this evaluation, samples collected in the B horizon of two Oxisol and a Ultisol were used, which presented, respectively, high presence of the mineral kaolinite, hematite and gibbsite. Samples were subjected to physical, chemical and mineralogical analysis and filled soil columns were submitted to leaching with solutions of electrical conductivity (CE) of 8.0 dS m-1 and sodium adsorption ratio (SAR) 0, 10, 20, 30, 40 and 50 (mmol L-1) 0.5, in three replications. The exchangeable sodium percentage (ESP) and exchangeable sodium adsorption ratio (ESR) were obtained by calculation from the values of exchangeable sodium in the soil. The increase in the SAR of percolation solution provided an increase in the ESR and ESP of all soils and was influenced by the mineralogy, weathering degree and clay content of soil. The analysed soils can receive waters with high SAR and EC without suffering significant sodification.

Palavras-chave : soil dispersion; exchangeable sodium percentage; exchangeable sodium ratio; sodification.

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