The relative effects of sodium and potassium on soil hydraulic conductivity and implications for winery wastewater management

• Published in: Geoderma Vol. 173-174; pp. 303 - 310
• Main Authors: Arienzo, M., Christen, E.W., Jayawardane, N.S., Quayle, W.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-03-2012; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Cations; Clay dispersion; Earth sciences; Earth, ocean, space; Exact sciences and technology; Fluid dynamics; Fluid flow; Fundamental and applied biological sciences. Psychology; Guidelines; Hydraulic conductivity; Hydraulics; Soil (material); Soils; Surface chemistry; Surficial geology; Synthetic aperture radar; Waste water; Wastewater; Wineries; WW; PAR; CEC; TEconc; ESP; EPP; SAR; Hydraulic conductivity; Clay dispersion; XRD; Wastewater; Guidelines; Cations; HC; Econc; EC; illite; potassium; Structure stability; kaolinite; waste water; potassium ion; clay; hydraulic conductivity; Sodium adsorption ratio; sheet silicates; silicates; soils; Land disposal; clastic rocks; Hydraulic properties; adsorption; Monovalent cation; Soil column; sodium ion; calcium ion; smectite; sedimentary rocks; sodium; management; clay minerals; Divalent cation
• ISSN: 0016-7061; 1872-6259
• DOI: 10.1016/j.geoderma.2011.12.012

The relative effects of Na+ and K+ on soil structural stability are not clearly defined by the existing literature. This is an important issue for the application of winery wastewater on soils as it contains high levels of K+ and varying levels of Na+. To evaluate the relative effects of Na+ and K+ on soil structural stability both surface and subsoil from a land application site for winery wastewater were used to assess changes in soil hydraulic conductivity in repacked soil columns. The soil was rich of smectite, 51–56%, with minor presence of illite, 5–8%, and kaolinite 10% clays. Solutions with sodium adsorption ratio (SAR) and potassium adsorption ratio (PAR) of 5–40, where the monovalent cation was Na+ or K+ and the divalent cation was Ca2+ or Mg2+ were used to leach the soil columns, at electrolyte concentrations ranging from 2.5 to 640meqL−1. In both surface and subsoil, percolating solutions with PAR or SAR, comprising all cation combinations, of 20 and 40 caused a decrease in hydraulic conductivity as electrolyte concentrations reduced. However, in PAR solutions the decreases in hydraulic conductivity were significantly smaller than the corresponding SAR solutions. These results indicated greater soil stability in the presence of K+ relative to Na+.
► Sodium cation solutions simulating winery wastewater cause reduction of HC. ► Greater soil stability in the presence of potassium. ► At SAR and PAR values of 5, there is little effects of Na+ or K+ on HC.