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https://hdl.handle.net/2440/47943
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Type: | Journal article |
Title: | Exchangeability of orthophosphate and pyrophosphate in soils: a double isotopic labelling study |
Author: | McBeath, T. Lombi, E. McLaughlin, M. Buenemann, E. |
Citation: | Plant and Soil: international journal on plant-soil relationships, 2009; 314(1-2):243-252 |
Publisher: | Kluwer Academic Publ |
Issue Date: | 2009 |
ISSN: | 0032-079X 1573-5036 |
Statement of Responsibility: | T. M. McBeath, E. Lombi, M. J. McLaughlin and E. K. Bünemann |
Abstract: | Liquid polyphosphate fertilisers have shown advantages in field experiments as a phosphorus (P) source for crops grown on calcareous soils. Polyphosphate fertilisers contain orthophosphate (oP), pyrophosphate (pP) and other condensed P species. A double labelling technique was developed using ion chromatography for separation of oP and pP, the major P species in polyphosphate fertilisers, in order to measure the isotopically exchangeable oP, pP and hydrolysed pP. Isotopically exchangeable P was measured in soils incubating for zero, three and 7 days after applying oP or pP to simulate a fertiliser band concentration at one g P kg−1 soil. The data from this incubation study suggest that pP addition initially resulted in less isotopically exchangeable P than oP addition but there was no significant difference in the total isotopically exchangeable P for the two different P sources after 7 days of incubation. The addition of pP to soil resulted in an increase in iron, aluminium and dissolved organic carbon in soil solution, and a decrease in calcium concentration in soil solution. This study has shown that the availability of P added as pP is governed by a complex series of processes that differ from the chemistry of oP reactions in soil. |
Keywords: | Fertilisers Lability Polyphosphate Calcareous soils |
DOI: | 10.1007/s11104-008-9723-0 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0454086 http://purl.org/au-research/grants/arc/LP0454086 |
Published version: | http://dx.doi.org/10.1007/s11104-008-9723-0 |
Appears in Collections: | Aurora harvest 6 Earth and Environmental Sciences publications Environment Institute publications |
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