fate of fertiliser P in soil under pasture and uptake by subterraneum clover – a field study using 33P-labelled single superphosphate
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...
Saved in:
Published in | Plant and soil Vol. 401; no. 1-2; pp. 23 - 38 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
01.04.2016
Springer |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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: 4–8 cm). 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. |
---|---|
Bibliography: | http://dx.doi.org/10.1007/s11104-015-2610-6 |
ISSN: | 0032-079X 1573-5036 |
DOI: | 10.1007/s11104-015-2610-6 |