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https://hdl.handle.net/1959.11/30443
Title: | Transformation of Calcium Phosphates in Alkaline Vertisols by Acidified Incubation | Contributor(s): | Andersson, Karl O (author); Tighe, Matthew K (author) ; Guppy, Christopher N (author) ; Milham, Paul J (author); McLaren, Timothy L (author); Schefe, Cassandra R (author); Lombi, Enzo (author); Lisle, Leanne M (author); Klysubun, Wantana (author) | Publication Date: | 2019-09-03 | Early Online Version: | 2019-08-16 | DOI: | 10.1021/acs.est.9b01565 | Handle Link: | https://hdl.handle.net/1959.11/30443 | Abstract: | Acid-soluble soil phosphorus (P) is a potential resource in P-limited agricultural systems that may become critical as global P sources decrease in the future. The fate of P in three alkaline Vertisols, a major agricultural soil type, after acidic incubation was investigated using synchrotron-based K-edge X-ray absorption near-edge structure (XANES) spectroscopy, geochemical modeling, wet chemistry soil extraction, and a P sorption index. Increases in labile P generally coincided with decreased stability and dissolution of calcium phosphate (CaP) minerals. However, only a minor proportion of the CaP dissolved in each soil was labile. In two moderate-P soils (800 mg P kg–1), XANES indicated that approximately 160 mg kg–1 was repartitioned to sorbed phases at pH 5.1 of one soil and at pH 4.4 of the second; however, only 40 and 28% were labile, respectively. In a high-P soil (8900 mg P kg–1), XANES indicated a decrease in P of 1170 mg kg–1 from CaP minerals at pH 3.8, of which approximately only 33% was labile. Phosphorus mobilized by agricultural practices without concurrent uptake by plants may be repartitioned to sorbed forms that are not as plant-available as prior to acidification. | Publication Type: | Journal Article | Source of Publication: | Environmental Science & Technology, 53(17), p. 10131-10138 | Publisher: | American Chemical Society | Place of Publication: | United States of America | ISSN: | 1520-5851 0013-936X |
Fields of Research (FoR) 2008: | 050304 Soil Chemistry (excl. Carbon Sequestration Science) 050302 Land Capability and Soil Degradation |
Fields of Research (FoR) 2020: | 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) 410601 Land capability and soil productivity |
Socio-Economic Objective (SEO) 2008: | 961402 Farmland, Arable Cropland and Permanent Cropland Soils | Socio-Economic Objective (SEO) 2020: | 180605 Soils | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science School of Science and Technology |
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