Cation exchange capacity of an oxisol amended with an effluent from domestic sewage treatment

Adriel Ferreira da Fonseca, Luís Reynaldo Ferracciú Alleoni, Adolpho José Melfi, Célia Regina Montes
2005 Scientia Agricola  
The addition of Na-rich anthropogenic residues to tropical soils has stimulated the scientific community to study the role of sodium in both the soil solution and the exchange complex. In this study, several different methods were used to calculate the concentration of exchangeable and soluble cations and this data was then used to establish correlations between the level of these cations and both the accumulation of various elements and the dry weight of maize grown in a greenhouse under
more » ... enhouse under different conditions. In the closed environments of the pots, the most suitable method for calculating the effective cation exchange capacity (ECEC) was the cation exchange capacity calculated by cations removed with barium chloride solution (CEC S). Then again, the actual cation exchange capacity (CEC A) should be measured by using Mg adsorption to prevent ionic force from influencing electric charges. A strong positive correlation was obtained between the concentrations of Na in the 1:2 soil:water extracts and the accumulation of Na in the maize plants, indicating saline or double acid extractors are not needed when monitoring the Na concentration only.
doi:10.1590/s0103-90162005000600007 fatcat:2ddp4lh5gnepvhm7ryrd6ncq3q