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Soil phosphorus dynamics following land application of unsaturated and partially saturated red mud and water treatment residuals

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Show simple item record Brennan, R.B. Murnane, John G. Sharpley, A. Herron, S. Brye, K. Simmons, T. 2020-04-16T11:13:04Z 2019
dc.identifier.issn 0301-4797
dc.description peer-reviewed en_US
dc.description.abstract The secondary use of P-sorbing industrial by-products as a fertilizer or soil conditioner is gaining increased attention, particularly in light of diminishing reserves of rock phosphate traditionally used to manufacture P fertilizer. This study examined applications of red mud (RM) and water treatment residuals (WTR) at two levels of P saturation (i.e. ‘as received’ and partially saturated) in a soil incubation and runoff plot study. When incubated with soils ranging in texture and initial P concentration, P-sorbing residuals that were less enriched with P decreased water-extractable soil P (WEP) concentration to a greater extent than more P saturated residuals. In contrast to WTR treatments, not all of the RM applications decreased soil WEP concentrations below those of the control soils. The runoff study investigated soil P dynamics when partially P-saturated RM and WTR's were surface applied to grass plots at 2 t ha−1 on Day 0, followed by three rainfall simulations (7 cm h−1 for 30 min, Days 2, 7 and 28) and at 3 t ha−1 on Day 70 followed by two more rainfall simulations (Days 77 and 96). Application of residuals at these rates did not significantly increase dissolved reactive P (DRP) in runoff compared with unamended controls during the study. Forage cuttings taken 90 days after the first rainfall simulation indicated that nutrient uptake was not compromised by the application of the residuals. Overall results indicate that WTRs may be a more suitable soil amendment than RM residuals given their greater ability to reduce soil WEP across a range of soils without simultaneously increasing Mehlich-3 extractable soil P concentrations above the upper threshold limit (150 mg P kg−1), and their minimal impact on plant nutrient uptake. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Journal of Environmental Management;248, 109296
dc.rights This is the author’s version of a work that was accepted for publication in Journal of Environmental Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Management, 248, 109296, en_US
dc.subject degree of P saturation en_US
dc.subject P filters en_US
dc.subject rainfall runoff en_US
dc.subject red mud en_US
dc.subject soil incubation en_US
dc.subject water treatment residual en_US
dc.title Soil phosphorus dynamics following land application of unsaturated and partially saturated red mud and water treatment residuals en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US 2020-04-07T14:38:27Z
dc.identifier.doi 10.1016/j.jenvman.2019.109296 2021-07-31
dc.embargo.terms 2021-07-31 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2922588
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Environmental Management
dc.description.status peer-reviewed

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