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- Title
The fate of fertiliser P in soil under pasture and uptake by subterraneum clover - a field study using P-labelled single superphosphate.
- Authors
McLaren, Timothy; McLaughlin, Michael; McBeath, Therese; Simpson, Richard; Smernik, Ronald; Guppy, Christopher; Richardson, Alan
- 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 P radiotracer, which was then applied to the soil surface (equivalent to ~12 kg P ha) 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: 4-8 cm). Results: The P diffusion patterns of the P-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.
- Subjects
SUPERPHOSPHATES; CLOVER; PHOSPHORUS in soils; PHOSPHATE fertilizers; GRASSLANDS; SUBTERRANEAN clover
- Publication
Plant & Soil, 2016, Vol 401, Issue 1/2, p23
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-015-2610-6