Threshold electrolyte concentration for dispersive soils in relation to CROSS

Poster

Marchuk, Alla, Rengasamy, Pichu and McNeill, Ann. 2012. "Threshold electrolyte concentration for dispersive soils in relation to CROSS." Birkett, L. L. and Sparrow, L. A. (ed.) 5th Joint Australian and New Zealand Soil Science Conference (SSA 2012): Soil Solutions for Diverse Landscapes. Hobart, Australia 02 - 07 Dec 2012 Melbourne, Australia.
Paper/Presentation Title

Threshold electrolyte concentration for dispersive soils in relation to CROSS

Presentation TypePoster
AuthorsMarchuk, Alla (Author), Rengasamy, Pichu (Author) and McNeill, Ann (Author)
EditorsBirkett, L. L. and Sparrow, L. A.
Journal or Proceedings TitleProceedings of the 5th Joint Australian and New Zealand Soil Science Conference (SSA 2012)
ERA Conference ID50979
Number of Pages4
Year2012
Place of PublicationMelbourne, Australia
ISBN9780646591421
Web Address (URL) of Paperhttp://www.soilscience2012.com
Conference/Event5th Joint Australian and New Zealand Soil Science Conference (SSA 2012): Soil Solutions for Diverse Landscapes
Joint Australian and New Zealand Soil Science Conference
Event Details
5th Joint Australian and New Zealand Soil Science Conference (SSA 2012): Soil Solutions for Diverse Landscapes
Parent
Joint Australian and New Zealand Soil Science Conference
Event Date
02 to end of 07 Dec 2012
Event Location
Hobart, Australia
Event Details
Joint Australian and New Zealand Soil Science Conference
Abstract

Sodium salts tend to dominate salt-affected soils and groundwater in Australia; therefore, sodium adsorption ratio (SAR) is used to parameterise soil sodicity and the effects of sodium on soil structure. However, some natural soils in Australia, and others irrigated with recycled water, have elevated concentrations of potassium and/or magnesium. Therefore, there is a need to derive and define a new ratio including these cations in place of SAR, which will indicate the dispersive effects of Na and K on clay dispersion, and Ca and Mg on flocculation. Based on the differential dispersive effects Na and K and the differential flocculation powers of Ca and Mg, we propose the concept of 'cation ratio of soil structural stability' (CROSS), analogous to SAR. This paper also gives the results of a preliminary experiment conducted on three soils varying in soil texture on hydraulic conductivity using percolating waters containing different proportions of the cations Ca, Mg, K, and Na. The relative changes in hydraulic conductivity of these soils, compared with the control treatment using CaCl2 solution, was highly correlated with CROSS. Clay dispersion in 29 soils treated with irrigation waters of varying cationic composition was highly correlated with CROSS rather than SAR. It was also found that CROSS measured in 1:5 soil/water extracts was strongly related to the ratio of exchangeable cations. These results encourage further study to investigate the use of CROSS as an index of soil structural stability in soils with different electrolytes, organic matter, mineralogy, and pH.

Keywordsexchangeable magnesium; exchangeable potassium; irrigation; sodicity; soil structure
ANZSRC Field of Research 2020401199. Environmental engineering not elsewhere classified
410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
300201. Agricultural hydrology
Public Notes

No evidence of copyright restrictions preventing deposit.

Byline AffiliationsUniversity of Adelaide
Institution of OriginUniversity of Southern Queensland
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