Threshold electrolyte concentration and dispersive potential in relation to CROSS in dispersive soils

Article

Marchuk, Alla and Rengasamy, Pichu. 2012. "Threshold electrolyte concentration and dispersive potential in relation to CROSS in dispersive soils." Soil Research. 50 (6), pp. 473-481. https://doi.org/10.1071/SR12135
Article Title

Threshold electrolyte concentration and dispersive potential in relation to CROSS in dispersive soils

ERA Journal ID5248
Article CategoryArticle
AuthorsMarchuk, Alla (Author) and Rengasamy, Pichu (Author)
Journal TitleSoil Research
Journal Citation50 (6), pp. 473-481
Number of Pages9
Year2012
PublisherCSIRO Publishing
Place of PublicationMelbourne, Australia
ISSN0004-9573
1446-568X
1838-675X
1838-6768
Digital Object Identifier (DOI)https://doi.org/10.1071/SR12135
Abstract

We have used the newly developed concept of CROSS (cation ratio of soil structural stability) instead of SAR (sodium adsorption ratio) in our study on dispersive soils. CROSS incorporates the differential dispersive powers of Na and K and the differences in the flocculating effects of Ca and Mg. The CROSS of the dispersed soil solutions, from the differently treated soils of three soil types varying in clay content, mineralogy, and organic matter, was highly correlated with the amount of clay dispersed. The relation between CROSS and exchangeable cation ratio depended on soil type, and particularly organic matter and the content and mineralogy of clay. Threshold electrolyte concentration of the flocculated suspensions was significantly correlated with CROSS of the dispersed suspensions. The cationic flocculating charge of the flocculated suspensions, which incorporates the individual flocculating powers of the cations, was significantly correlated with CROSS. However, these types of relations will depend on several soil factors even within a given soil class. Therefore, we have derived the dispersive potential of an individual soil from which we calculated the required cationic amendments to maintain flocculated soils and their structural integrity.

Keywordscationic flocculating charge; clay dispersion; flocculating power; soil structure
ANZSRC Field of Research 2020340305. Physical properties of materials
410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
300202. Agricultural land management
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Byline AffiliationsUniversity of Adelaide
Institution of OriginUniversity of Southern Queensland
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