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Type: Journal article
Title: The effect of soil water status on fertiliser, topsoil and subsoil phosphorus utilisation by wheat
Author: McBeath, T.
McLaughlin, M.
Kirby, J.
Armstrong, R.
Citation: Plant and Soil: international journal on plant-soil relationships, 2012; 358(1-2):337-348
Publisher: Kluwer Academic Publ
Issue Date: 2012
ISSN: 0032-079X
Statement of
T. M. McBeath & M. J. McLaughlin & J. K. Kirby & R. D. Armstrong
Abstract: Background and aims Crop phosphorus (P) content is controlled by P uptake from both banded P fertiliser and from P throughout the soil profile. These P supply factors are in turn controlled by soil, climatic and plant factors. The aim of this experiment was to measure the contribution of fertiliser, topsoil and subsoil P to wheat plants under wet and dry growing season conditions. Methods An isotopic tracer technique was used to measure P uptake from fertiliser at seven agricultural field sites under wet and dry growing season conditions. At three of these sites a dual isotopic technique was used to distinguish between wheat uptake of P from fertiliser, topsoil (0–15 cm) and subsoil (below 15 cm). Results The amount of P fertiliser used by wheat was in the order of 3–30% of the P applied and increased with increasing rainfall. Topsoil P was the most important P source, but when sufficient P was present in the subsoil, P fertiliser addition stimulated the use of subsoil P. Conclusions Most crop P uptake was from the topsoil, however P fertiliser banded below the seed increased plant P uptake and stimulated the use of subsoil P in one soil type in a decile 7 (above average rainfall) growing season.
Keywords: Fertiliser efficiency
Isotopic tracing
Isotopic dilution
Crop nutrition
Rights: © Springer Science+Business Media B.V. 2012
DOI: 10.1007/s11104-012-1177-8
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Appears in Collections:Agriculture, Food and Wine publications
Aurora harvest
Environment Institute publications

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