Targeting Subsoil Constraints in Southern Queensland: Concept Proof of Spraying Polyacrylamide for Subsoil Stabilisation during Tillage

Article


Zhu, Yingcan, Ali, Aram, Bennett, John McLean, Guppy, Chris and McKenzie, David. 2022. "Targeting Subsoil Constraints in Southern Queensland: Concept Proof of Spraying Polyacrylamide for Subsoil Stabilisation during Tillage ." Sustainability. 14 (20), pp. 1-16. https://doi.org/10.3390/su142013147
Article Title

Targeting Subsoil Constraints in Southern Queensland: Concept Proof of Spraying Polyacrylamide for Subsoil Stabilisation during Tillage

ERA Journal ID41498
Article CategoryArticle
AuthorsZhu, Yingcan, Ali, Aram, Bennett, John McLean, Guppy, Chris and McKenzie, David
Journal TitleSustainability
Journal Citation14 (20), pp. 1-16
Article Number13147
Number of Pages16
Year2022
PublisherMDPI AG
Place of PublicationSwitzerland
ISSN2071-1050
Digital Object Identifier (DOI)https://doi.org/10.3390/su142013147
Web Address (URL)https://www.mdpi.com/2071-1050/14/20/13147
Abstract

Deep ripping, in conjunction with gypsum and/or organic amendment, is known to be useful for removing physical constraints and improving crop yields in dispersive subsoils. However, the benefits are short-lived due to lateral movement of Na into soil between the rip lines, and slumping following the wetting of loosened soil, leaving low pore volume for air and water movement. This study evaluated the effect of high concentration polyacrylamide (PAM) solutions on stabilising soil structure, with a focus on PAM application on dispersive aggregates theoretically dislodged by ripping, as part of the subsoil decompaction. Three distinct soils (Vertosol, Kandosol, and Dermosol) from southern Queensland were treated to be sodic. These aggregates were further applied with PAM solutions under three scenarios, including: immersion, coating, and no application. In general, PAM stabilised soil aggregates with a concentration above 1.5 g L–1 when immersed into PAM solution or coated with PAM product, as compared to non-PAM-treated samples. The efficacy depended on PAM concentration, viscosity, soil type, and mechanical force. The concept of spraying PAM for stabilising the subsoil during tillage was proposed, as there is feasible potential for PAM to prolong the benefits of subsoil decompaction long enough through stabilising aggregate structure.

Keywordsclay dispersion; soil structural stability; tillage; viscosity
ANZSRC Field of Research 2020410699. Soil sciences not elsewhere classified
FunderCotton Research and Development Corporation
Byline AffiliationsCentre for Sustainable Agricultural Systems
The Soil Company, Australia
University of New England
Soil Management Designs, Australia
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