期刊
PLANT AND SOIL
卷 314, 期 1-2, 页码 243-252出版社
SPRINGER
DOI: 10.1007/s11104-008-9723-0
关键词
Fertilisers; Lability; Polyphosphate; Calcareous soils
资金
- Australian Research Council [LP0454086]
- South Australian Grain Industry Trust (SAGIT)
- Wesfarmers CSBP Ltd
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.
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