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https://hdl.handle.net/1959.11/16874
Title: | Dilute Acid Extraction is a useful Indicator of the Supply of Slowly Available Phosphorus in Vertisols | Contributor(s): | McLaren, Timothy (author); Guppy, Christopher (author) ; Tighe, Matthew (author); Moody, Phil (author); Bell, Mike (author) | Publication Date: | 2014 | DOI: | 10.2136/sssaj2013.05.0188 | Handle Link: | https://hdl.handle.net/1959.11/16874 | Abstract: | Long-term studies suggest readily available P, measured using a bicarbonate extractant, can be replenished by slowly available inorganic P pools. The aim of this study was to estimate the supply of slowly available P to the soil solution. Readily and slowly available P pools were measured using two agronomic soil P tests (the bicarbonate (Colwell) and dilute acid (Bureau of Sugar Experiment Stations; BSES) extractants, respectively) in vertisol soils of the northern grains region (NGR) of eastern Australia. The amount of P supplied to the soil solution was estimated by the iron oxide sink method accumulated over 96 h (FeOt-P). The readily available P pool (i.e., Colwell-P) was strongly correlated with FeOt-P, and this pool was likely to be replenished by the slowly available P pool (i.e., BSES-P) when BSES-P concentrations were >61 mg P kg⁻¹. The slowly available P pool did not supply the readily available P pool when the Ca (mg kg⁻¹)/P (mg kg⁻¹) ratio in the BSES extract was >74:1, suggesting the presence of Ca phosphates of low solubility affected potential buffering. Using a multiple linear regression, approximately 75% of the variability in the ability of the slowly available P pool to supply soil solution P could be explained by the quantity of BSES-P and the ratio of Ca/P in the BSES extract. | Publication Type: | Journal Article | Source of Publication: | Soil Science Society of America Journal, 78(1), p. 139-146 | Publisher: | Soil Science Society of America | Place of Publication: | United States of America | ISSN: | 1435-0661 0361-5995 |
Fields of Research (FoR) 2008: | 050304 Soil Chemistry (excl Carbon Sequestration Science) | Fields of Research (FoR) 2020: | 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) | Socio-Economic Objective (SEO) 2008: | 820507 Wheat 820404 Sorghum |
Socio-Economic Objective (SEO) 2020: | 260312 Wheat 260310 Sorghum |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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