The soil specific nature of threshold electrolyte concentration analysis

Bennett, J. McL. and Raine, S. R. (2012) The soil specific nature of threshold electrolyte concentration analysis. In: 5th Joint Australian and New Zealand Soil Science Conference: Soil Solutions for Diverse Landscapes (SSA 2012), 2-7 Dec 2012, Hobart, Australia.

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Abstract

Maintenance of soil permeability is paramount to irrigation, especially as the use of saline-sodic waters increase. While research has shown that, soil permeability can be maintained under high sodicity conditions, provided the electrolyte concentration is sufficiently high, there is relatively little information depicting threshold electrolyte concentrations (TEC) relationships. Furthermore, even though TEC curves have been shown to be soil specific and dependent on soil properties such as clay mineralogy, clay content and organic matter content, guidelines for irrigation management in Australia do not currently acknowledge this. The work reported in this paper provides examples of TEC relationships for a range of soils from southern Queensland. Through correlation analysis, the work also investigates the role of clay content, mineralogy and organic matter in determining these relationships. Calculation of TEC curves for 6 south-eastern Queensland soils illustrated that TEC relationships are soil specific, even within soil orders; contrary to current guidelines. Additionally, correlation analysis revealed that there were no apparent relationships between the critical EC and SAR values (those determining TEC functions) and soil properties such as clay mineralogy, clay content and organic matter content.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions preventing deposit.
Depositing User: Mr John Bennett
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 29 Nov 2012 03:11
Last Modified: 14 Aug 2014 05:06
Uncontrolled Keywords: water resources; irrigation; chemicals in water
Fields of Research (FOR2008): 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils
URI: http://eprints.usq.edu.au/id/eprint/22151

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