The effect of soil water status on fertiliser, topsoil and subsoil phosphorus utilisation by wheat

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dc.contributor.authorMcBeath, T.
dc.contributor.authorMcLaughlin, M.
dc.contributor.authorKirby, J.
dc.contributor.authorArmstrong, R.
dc.date.issued2012
dc.description.abstractBackground 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.
dc.description.statementofresponsibilityT. M. McBeath & M. J. McLaughlin & J. K. Kirby & R. D. Armstrong
dc.identifier.citationPlant and Soil: international journal on plant-soil relationships, 2012; 358(1-2):337-348
dc.identifier.doi10.1007/s11104-012-1177-8
dc.identifier.issn0032-079X
dc.identifier.issn1573-5036
dc.identifier.orcidMcBeath, T. [0000-0001-6423-367X]
dc.identifier.orcidMcLaughlin, M. [0000-0001-6796-4144]
dc.identifier.urihttp://hdl.handle.net/2440/73841
dc.language.isoen
dc.publisherKluwer Academic Publ
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0882492
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0882492
dc.rights© Springer Science+Business Media B.V. 2012
dc.source.urihttps://doi.org/10.1007/s11104-012-1177-8
dc.subjectFertiliser efficiency
dc.subjectIsotopic tracing
dc.subjectIsotopic dilution
dc.subjectDrought
dc.subjectCrop nutrition
dc.titleThe effect of soil water status on fertiliser, topsoil and subsoil phosphorus utilisation by wheat
dc.typeJournal article
pubs.publication-statusPublished

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