Dilute acid extraction is a useful indicator of the supply of slowly available phosphorus in Vertisols

McLaren, Timothy I., Guppy, Christopher N., Tighe, Matthew K., Moody, Phil and Bell, Mike (2013) Dilute acid extraction is a useful indicator of the supply of slowly available phosphorus in Vertisols. Soil Science Society of America Journal, First Look 1-30. doi:10.2136/sssaj2013.05.0188

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Author McLaren, Timothy I.
Guppy, Christopher N.
Tighe, Matthew K.
Moody, Phil
Bell, Mike
Title Dilute acid extraction is a useful indicator of the supply of slowly available phosphorus in Vertisols
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 0361-5995
1435-0661
Publication date 2013
Sub-type Article (original research)
DOI 10.2136/sssaj2013.05.0188
Volume First Look
Start page 1
End page 30
Total pages 30
Place of publication Madison, WI, United States
Publisher Soil Science Society of America
Collection year 2014
Language eng
Formatted abstract
Long-term studies suggest readily available phosphorus (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 (BSES) extractants, respectively) in Vertisol soils of the northern grains region of eastern Australia. The amount of P supplied to the soil solution was estimated by the iron oxide sink method accumulated over 96 hours (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. The slowly available P pool did not supply the readily available P pool when the calcium (Ca) (mg/kg)/P (mg/kg) 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.
Keyword Agronomic soil P test
BSES
Dilute acid extractant
Iron oxide extractable P
Reserve P
Vertosol
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 14 Oct 2013, 12:09:03 EST by Associate Professor Michael Bell on behalf of Centre for Plant Science