Cation ratio of soil structural stability (CROSS)

Marchuk, Alla G. and Rengasamy, Pichu (2010) Cation ratio of soil structural stability (CROSS). In: 19th World Congress of Soil Science: Soil Solutions for a Changing World, 1-6 Aug 2010, Brisbane, Australia.

[img]
Preview
Text (Published Version)
Marchuk_Rengasamy_SSA2010_PV.pdf

Download (127Kb) | Preview

Abstract

Sodium salts tend to dominate salt-affected soils and groundwater in Australia and therefore, sodium adsorption ratio (SAR) is being used to parameterize soil sodicity and the effects of sodium on soil structure. Recent reports, however, now draw attention to elevated concentrations of potassium and/or magnesium in some soils naturally and also as a result of increasing irrigation with recycled water in Australia. Therefore, there is a need to derive and define a new ratio of these cations in place of SAR, which will indicate the effects of Na and K on clay dispersion and Ca and Mg on flocculation. Rengasamy and Sumner (1998) derived the flocculation power of these cations and on this basis Rengasamy (unpublished) defined the cation ratio of soil structural stability (CROSS). This paper gives the results of an experiment conducted on ten soil samples on hydraulic conductivity using a number of artificially prepared irrigation waters, containing different proportions of the cations Ca, Mg, K and Na. The relative changes in hydraulic conductivity of these soils reflected the flocculating power of the cations, compared to the control treatment of using CaCl2 solution. Clay dispersion was found to be highly correlated to CROSS rather than to SAR.


Statistics for USQ ePrint 25907
Statistics for this ePrint Item
Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2010 by the Australian Society of Soil Science Incorporated. 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.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 03 Sep 2014 02:21
Last Modified: 03 Sep 2014 02:21
Uncontrolled Keywords: sodicity; soil structure; irrigation; potassium; cations
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective: D Environment > 96 Environment > 9614 Soils > 961499 Soils not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/25907

Actions (login required)

View Item Archive Repository Staff Only