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 and R. J. Gilkes BA 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
Australian Journal of Soil Research 42(7) 763-766 https://doi.org/10.1071/SR04022
Submitted: 10 February 2004 Accepted: 5 June 2004 Published: 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.
Acknowledgments
Technical assistance was provided by M. J. Baker and R. J. Lunt. The Chemistry Centre (WA) measured Colwell soil test P and the soil properties listed in Table 1. Funds were provided by the Western Australian Department of Agriculture and the Australian Wool Research Trust Fund.
AOAC (1975).
Barrow NJ, Shaw TC
(1976) Sodium bicarbonate as an extractant for soil phosphate. III. Effects of the buffering capacity of a soil for phosphate. Geoderma 16, 273–283.
| Crossref | GoogleScholarGoogle Scholar |
Bolland MDA, Gilkes RJ
(1990) Rock phosphates are not effective fertilisers in Western Australian soils: a review of one hundred years of research. Fertilizer Research 22, 79–95.
Colwell JD
(1963) The estimation of phosphorus fertiliser requirements of wheat in southern New South Wales by soil analysis. Australian Journal of Experimental Agriculture and Animal Husbandry 3, 190–197.
Colwell JD
(1965) An automatic procedure for the determination of phosphorus in sodium hydrogen bicarbonate extract of soil. Chemistry and Industry 1965, 749–895.
Fleming NK,
Bolland MDA, Gilbert MA
(1997) Effect of reactive phosphate rocks and water-soluble phosphorus fertilisers on extractable phosphorus concentrations in soil. Australian Journal of Experimental Agriculture 37, 1009–1017.
| Crossref | GoogleScholarGoogle Scholar |
Helyar KR, Spencer K
(1977) Sodium bicarbonate soil test values and the phosphate buffering capacity of soils. Australian Journal of Soil Research 15, 263–273.
Loveday, J (1974). ‘Methods for analysis of irrigated soils.’ Technical Communication No. 54. (Commonwealth Bureau of Soils: Harpenden, England)
Olsen SR, Cole CV, Watanabe FS, Dean LA
(1954) Estimation of available phosphorus in soils by extraction with sodium bicarbonate. United States Department of Agriculture Circular No.939.
Ozanne PG, Shaw TC
(1968) Advantages of the recently developed phosphate sorption test over the older extractant methods for soil phosphate. ‘Transactions of the 9th International Congress of Soil Science’. Vol. 2 (International Society of Soil Science: Adelaide, S. Aust.)
Rayment, GE ,
and
Higginson, FR (1992).
Walkley A, Black IA
(1934) An examination of the Degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Science 37, 29–38.
