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Quantifying the aggregation-dispersion boundary condition in terms of saturated hydraulic conductivity reduction and the threshold electrolyte concentration

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  • Dang, A.
  • Bennett, J. McL.
  • Marchuk, A.
  • Biggs, A.
  • Raine, S.R.

Abstract

Marginal quality saline sodic water will be important for agricultural production in water limited environments, and has been demonstrated as suitable for irrigation on a soil-specific basis. Suitability is usually demonstrated as the threshold electrolyte concentration (CTH), defined as a 10–20% reduction in saturated hydraulic conductivity. Others have suggested that the aggregate-dispersion boundary may be used as this threshold, which is also known as the threshold turbidity concentration (CTU). Using a saturated hydraulic conductivity approach, this work sought to quantify the extent of reduction at the CTU and compare this to traditional CTH approaches to define the practicality of the thresholds. The CTU was determined as the point where dispersed clay was detected, and subsequently compared to the CTH with the difference between these compared within the measured domain. The reduction in saturated hydraulic conductivity from a Ca dominant stable condition was determined at each threshold value. It was found that saturated hydraulic conductivity at the CTU reduced by between 44 and 78% for the five Vertisol soils investigated, demonstrating that the CTU varied between soils and was substantially more than the 10–20% reduction in hydraulic conductivity at the CTH. Discussion on application of these thresholds to practical irrigation is provided, and suggests that irrigation water quality application can be optimised on a soil-specific basis. Results reinforce that management guidelines should not be based on the CTU, or at the aggregation-dispersion boundary.

Suggested Citation

  • Dang, A. & Bennett, J. McL. & Marchuk, A. & Biggs, A. & Raine, S.R., 2018. "Quantifying the aggregation-dispersion boundary condition in terms of saturated hydraulic conductivity reduction and the threshold electrolyte concentration," Agricultural Water Management, Elsevier, vol. 203(C), pages 172-178.
    • Handle: RePEc:eee:agiwat:v:203:y:2018:i:c:p:172-178
    DOI: 10.1016/j.agwat.2018.03.005
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    References listed on IDEAS

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    1. Qadir, Manzoor & Wichelns, D. & Raschid-Sally, Liqa & Minhas, P. S. & Drechsel, Pay & Bahri, Akissa & McCornick, Peter G. & Abaidoo, Robert Clement & Attia, F. & El-Guindy, S. & Ensink, J. H. J. & Jim, 2007. "Agricultural use of marginal-quality water: opportunities and challenges," Book Chapters,, International Water Management Institute.
    2. Qadir, Manzoor & Wichelns, D & Raschid-Sally, Liqa & Minhas, P. S. & Drechsel, Pay & Bahri, Akissa & McCornick, Peter G. & Abaidoo, R. & Attia, F. & El-Guindy, S. & Ensink, J. H. J. & Jimenez, B. & Ki, 2007. "Agricultural use of marginal-quality water: opportunities and challenges," IWMI Books, Reports H040204, International Water Management Institute.
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    1. Dang, A. & Bennett, J. McL. & Marchuk, A. & Marchuk, S. & Biggs, A.J.W. & Raine, S.R., 2018. "Validating laboratory assessment of threshold electrolyte concentration for fields irrigated with marginal quality saline-sodic water," Agricultural Water Management, Elsevier, vol. 205(C), pages 21-29.
    2. Afshin Ghahramani & John McLean Bennett & Aram Ali & Kathryn Reardon-Smith & Glenn Dale & Stirling D. Roberton & Steven Raine, 2021. "A Risk-Based Approach to Mine-Site Rehabilitation: Use of Bayesian Belief Network Modelling to Manage Dispersive Soil and Spoil," Sustainability, MDPI, vol. 13(20), pages 1-23, October.
    3. Ali, Aram & Bennett, John McL & Biggs, Andrew A.J. & Marchuk, Alla & Ghahramani, Afshin, 2021. "Assessing the hydraulic reduction performance of HYDRUS-1D for application of alkaline irrigation in variably-saturated soils: Validation of pH driven hydraulic reduction scaling factors," Agricultural Water Management, Elsevier, vol. 256(C).

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