Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||Exchangeability of orthophosphate and pyrophosphate in soils: a double isotopic labelling study|
|Citation:||Plant and Soil, 2009; 314(1-2):243-252|
|Publisher:||Kluwer Academic Publ|
|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|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute publications
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.