Validating laboratory assessment of threshold electrolyte concentration for fields irrigated with marginal quality saline-sodic water

Dang, A. and Bennett, J. McL. and Marchuk, A. and Marchuk, S. and Biggs, A. J. W. and Raine, S. R. (2018) Validating laboratory assessment of threshold electrolyte concentration for fields irrigated with marginal quality saline-sodic water. Agricultural Water Management, 205. pp. 21-29. ISSN 0378-3774

Abstract

The use of marginal quality saline-sodic (MQSS) water for agricultural production is important in water limited environments and with a growing demand for food and fibre. Soil structural response to irrigation water quality is known to be a function of sodium contained in the irrigation water and the electrolyte concentration of that water. The threshold electrolyte concentration (CTH) is classically used to determine the suitability of water to be applied to a soil, and is usually conducted as a laboratory analysis utilising saturated hydraulic conductivity. This work aimed to validate the laboratory based semi-empirical disaggregation model approach to CTH against field soils where MQSS water had been applied for an extended period of time. Unirrigated locations proximal to long-term irrigation sites were paired to provide control conditions and the CTH was determined. Reduction in hydraulic conductivity from the control was determined as both observed and predicted data. Results supported validation of the approach, indicating the disaggregation model as useful for proactive planning of irrigation systems with regard to water quality and a good measure for identification of MQSS water as a strategic resource. Applicability of the results to irrigation guidelines was discussed with particular focus on removal of generalised guidelines and identification of what constitutes tolerable hydraulic conductivity reduction.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 25 Jan 2019 05:54
Last Modified: 05 Feb 2019 01:30
Uncontrolled Keywords: dispersion; swelling; aggregate stability; threshold turbidity concentration
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8298 Environmentally Sustainable Plant Production > 829899 Environmentally Sustainable Plant Production not elsewhere classified
Identification Number or DOI: 10.1016/j.agwat.2018.04.037
URI: http://eprints.usq.edu.au/id/eprint/34772

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