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|Title:||The effect of soil water status on fertiliser, topsoil and subsoil phosphorus utilisation by wheat|
|Citation:||Plant and Soil, 2012; 358(1-2):337-348|
|Publisher:||Kluwer Academic Publ|
|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|
|Appears in Collections:||Agriculture, Food and Wine publications|
Environment Institute publications
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