Please use this identifier to cite or link to this item: 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)orcid ; Guppy, Christopher N  (author)orcid ; 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
Appears in Collections:Journal Article
School of Environmental and Rural Science
School of Science and Technology

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