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Type: Journal article
Title: Dilute acid extraction is a useful indicator of the supply of slowly available phosphorus in vertisols
Author: McLaren, T.
Guppy, C.
Tighe, M.
Moody, P.
Bell, M.
Citation: Soil Science Society of America Journal, 2014; 78(1):139-146
Publisher: Soil Science Society of America
Issue Date: 2014
ISSN: 0361-5995
Statement of
Timothy I. McLaren, Christopher N. Guppy, Matthew K. Tighe, Phil Moody, Mike Bell
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.
Rights: © Soil Science Society of America. All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
DOI: 10.2136/sssaj2013.05.0188
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Appears in Collections:Agriculture, Food and Wine publications
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