Changes and availability of P fractions following 65 years of P application to a calcareous soil in a Mediterranean climate

Vu, D. T., Tang, C. and Armstrong, R. D. (2008) Changes and availability of P fractions following 65 years of P application to a calcareous soil in a Mediterranean climate. Plant and Soil, 304 1-2: 21-33. doi:10.1007/s11104-007-9516-x


Author Vu, D. T.
Tang, C.
Armstrong, R. D.
Title Changes and availability of P fractions following 65 years of P application to a calcareous soil in a Mediterranean climate
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
1573-5036
Publication date 2008-03-01
Year available 2007
Sub-type Article (original research)
DOI 10.1007/s11104-007-9516-x
Volume 304
Issue 1-2
Start page 21
End page 33
Total pages 13
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
The fate and availability of P derived from granular fertilisers in an alkaline Calcarosol soil were examined in a 65-year field trial in a semi-arid environment (annual rainfall 325 mm). Sequential P fractionation was conducted in the soils collected from the trial plots receiving 0–12 kg P ha−1crop−1, and the rhizosphere soil after growing wheat (Triticum aestivum L. cv. Yitpi) and chickpea (Cicer arietinum L. cv. Genesis 836) for one or two 60-day cycles in the glasshouse. Increasing long-term P application rate over 65 years significantly increased all inorganic P (Pi) fractions except HCl–Pi. By contrast, P application did not affect or tended to decrease organic P (Po) fractions. Increasing P application also increased Olsen-P and resin-P but decreased the P buffer capacity and sorption maxima. Residual P, Pi and Po fractions accounted for an average of 32, 16 and 52% of total P, respectively. All soil P fractions including residual P in the rhizosphere soil declined following 60-day growth of either wheat or chickpea. The decreases were greater in soils with a history of high P application than low P. An exception was water-extractable Po, which increased following plant growth. Changes in various P fractions in the rhizosphere followed the same pattern for both plant species. Biomass production and P uptake of the plants grown in the glasshouse correlated positively with the residual P and inorganic fractions (except HCl–Pi) but negatively with Po in the H2O-, NaOH- and H2SO4-fractions of the original soils. The results suggest that the long-term application of fertiliser P to the calcareous sandy soil built up residual P and non-labile Pi fractions, but these P fractions are potentially available to crops.
Keyword Long-term experiment
Organic P
P buffer capacity
P sorption
P transformation
Rhizosphere acidification
Sequential extraction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Published online: 20 December 2007.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Wed, 21 Sep 2011, 02:46:57 EST by Dr Dang Vu on behalf of School of Chemical Engineering