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https://hdl.handle.net/2440/73841
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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 1573-5036 |
Statement of Responsibility: | 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 Drought Crop nutrition |
Rights: | © Springer Science+Business Media B.V. 2012 |
DOI: | 10.1007/s11104-012-1177-8 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0882492 http://purl.org/au-research/grants/arc/LP0882492 |
Published version: | http://dx.doi.org/10.1007/s11104-012-1177-8 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest Environment Institute publications |
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