The systematic effect of soil P buffer capacity on Colwell soil P test v. plant response calibration exists only when field experiments are adjacent

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Contents Vol 42(7)

doi:10.1071/SR04022

The systematic effect of soil P buffer capacity on Colwell soil P test v. plant response calibration exists only when field experiments are adjacent

M. D. A. Bolland ^A ^C, R. J. Gilkes ^B

^A Department of Agriculture, PO Box 1231, Bunbury, WA 6231, Australia.
^B School of Earth and Geographical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
^C Corresponding author. Email: mbolland@agric.wa.gov.au





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Soil Research 42(7) 763–766 http://dx.doi.org/10.1071/SR04022
Submitted: 10 February 2004 Accepted: 5 June 2004 Published online: 12 November 2004

Abstract

Thirteen field experiments distributed throughout south-western Australia examined the relationship between percentage of maximum grain yield of wheat (Triticum aestivum L. cv. Aroona) and Colwell soil phosphorus (P) values. These calibration data were fitted to a linear equation, and the slope values for the 13 sites were compared with the P buffer capacity (PBC) of the soils. There was no systematic relationship between these variables except for 3 adjacent sites at Badgingarra and for 3 adjacent sites at Newdegate. We conclude that differences in climate and site conditions have a greater effect than PBC on Colwell soil P test calibration when widely separated sites are compared.