Evaluating dispersive potential to identify the threshold electrolyte concentration in non-dispersive soils
A. Dang A , J. Bennett A C , A. Marchuk A , A. Biggs B and S. Raine A
+ Author Affiliations
- Author Affiliations
A University of Southern Queensland, West St, Toowoomba, Qld 4350, Australia.
B Department of Natural Resources and Mines, Tor St, Toowoomba, Qld 4350, Australia.
C Corresponding author. Email: John.Bennett@USQ.edu.au
Soil Research 56(6) 549-559 https://doi.org/10.1071/SR17304
Submitted: 9 November 2017 Accepted: 22 April 2018 Published: 17 July 2018
Abstract
Use of non-traditional and marginal quality saline sodic water will increase in water limited environments and methods to assess use suitability are required. The threshold electrolyte concentration (CTH) defines the soil solution concentration, for a given soil solution sodicity, at which an acceptable reduction in the soil hydraulic conductivity (10–25%) is maintained without further soil structural degradation. The traditional method of determining CTH is via leaching columns, which are laborious and often expensive. Dispersive potential (PDIS) is potentially a more rapid method with which to determine the CTH in a practical sense and make management recommendations for water quality use on a given soil. This work evaluated the PDIS method against known CTH data to determine the efficacy of use for non-dispersive soils irrigated with marginal quality saline sodic water. Results suggest that the PDIS approach to CTH did not reliably, or efficiently, determine the CTH in non-dispersive soils equilibrated with an irrigation solution. Using it to determine the aggregation and dispersion boundary for initially non-dispersive soil appeared to have merit, but only where the aggregates equilibrated with the irrigation solution were subject to rapid dilution with deionised water.
Additional keywords: Dispersion, equilibration, sodium absorption ratio, electrical conductivity, marginal quality water.
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