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Title: The fate of fertiliser P in soil under pasture and uptake by subterraneum clover: a field study using ³³P-labelled single superphosphate
Contributor(s): McLaren, Timothy (author); McLaughlin, Michael J (author); McBeath, Therese M (author); Simpson, Richard J (author); Smernik, Ronald J (author); Guppy, Christopher  (author)orcid ; Richardson, Alan E (author)
Publication Date: 2016
Open Access: Yes
DOI: 10.1007/s11104-015-2610-6
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Abstract: Background and aims: Single superphosphate (SSP) is a major source of phosphorus (P) used in grazing systems to improve pasture production. The aim of this experiment was to determine the fate of fertiliser P in clover pastures under field conditions. Methods: A procedure was developed to radiolabel SSP granules with a ³³P radiotracer, which was then applied to the soil surface (equivalent to ~12 kg P ha‾¹) of a clover pasture. Recovery of fertiliser P was determined in clover shoots, fertiliser granules and soil fractions (surface layer: 0-4 cm and sub-surface layer: 4-8cm). Results: The P diffusion patterns of the ³³P-labelled SSP granules were not significantly different to those of commercial SSP granules (P > 0.05). Recovery of fertiliser P in clover shoots was 30-35 %. A considerable proportion of the fertiliser P (~28 %) was recovered in the surface soil layer and was largely inorganic P. Conclusions: Recovery of fertiliser P by clover plants was up to 35 % in the year of application. Much of the fertiliser P in soil fractions was inorganic P, which highlights the importance of inorganic P forms and dynamics in soils under clover pasture on a single season timeframe at these sites.
Publication Type: Journal Article
Source of Publication: Plant and Soil, 401(1-2), p. 23-38
Publisher: Springer Netherlands
Place of Publication: Dordrecht, The Netherlands
ISSN: 0032-079X
Field of Research (FOR): 050304 Soil Chemistry (excl. Carbon Sequestration Science)
070306 Crop and Pasture Nutrition
Socio-Economic Outcome Codes: 830403 Native and Residual Pastures
961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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