Effect of cation ratio on soil structural stability is related to the zeta potential of dispersed clay

Poster

McNeill, Ann, Rengasamy, Pichu and Marchuk, Alla. 2011. "Effect of cation ratio on soil structural stability is related to the zeta potential of dispersed clay." International Annual Meeting of the Soil Science Society of America (SSSA 2011): Fundamentals for Life: Soil, Crop, and Environmental Sciences. San Antonio, United States 16 - 19 Nov 2011 Madison, WI. United States.
Paper/Presentation Title

Effect of cation ratio on soil structural stability is related to the zeta potential of dispersed clay

Presentation TypePoster
AuthorsMcNeill, Ann (Author), Rengasamy, Pichu (Author) and Marchuk, Alla (Author)
Journal or Proceedings TitleInternational Annual Meeting of the Soil Science Society of America (SSSA 2011)
Year2011
Place of PublicationMadison, WI. United States
Web Address (URL) of Paperhttps://scisoc.confex.com/crops/2011am/webprogram/Paper64277.html
Conference/EventInternational Annual Meeting of the Soil Science Society of America (SSSA 2011): Fundamentals for Life: Soil, Crop, and Environmental Sciences
Event Details
International Annual Meeting of the Soil Science Society of America (SSSA 2011): Fundamentals for Life: Soil, Crop, and Environmental Sciences
Event Date
16 to end of 19 Nov 2011
Event Location
San Antonio, United States
Abstract

Water interaction with soil aggregates leads to clay swelling and dispersion, resulting in the deterioration of soil structure with reduction in soil porosity, aeration and water movement. The integrity of soil aggregates depends on the degree of ionicity of clay-cation bonds which determines the interaction of polar water molecules. Based on this, Rengasamy and Marchuk (2011) have proposed, instead of using sodium absorption ratio (SAR), the use of cation ratio of soil structural stability (CROSS) which takes into account the differential effects of Na and K in dispersing soil clays, and the differential effects of Ca and Mg in flocculating soil clays. CROSS (mol0.5 m-1.5) is defined as (Na+0.56K). (Ca+0.6Mg) -0.5. It is calculated from the concentrations of Na, K, Mg and Ca in soil-water extracts. Spontaneously dispersed clay from a number of soils collected from different locations in South Australia containing varying amounts of Na, K, Mg and Ca was highly correlated with CROSS rather than SAR. The relative changes in hydraulic conductivity of four soils was also highly correlated with CROSS rather than SAR. It was found that the effects of CROSS, at a comparable ionic strength, were influenced by soil pH and organic matter content. While increasing pH increased the amount of dispersible clay, the increasing organic matter reduced it. In all cases, the zeta potential of dispersed clay was highly correlated with the amount of dispersed clay, indicating that the net charge on soil clays affected by soil components is an important factor in soil structural stability. Further experiments are in progress to develop 'Quirk-Schofield' type threshold electrolyte concentration in relation to CROSS for a more general application by including net charge of soils as a third factor and thereby eliminating the variations caused by pH and organic matter.

ANZSRC Field of Research 2020410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
300201. Agricultural hydrology
410601. Land capability and soil productivity
Public Notes

© 2011 Soil Science Society of America. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Session 8686

Byline AffiliationsUniversity of Adelaide
Institution of OriginUniversity of Southern Queensland
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