Journal
PLANT AND SOIL
Volume 401, Issue 1-2, Pages 93-107Publisher
SPRINGER
DOI: 10.1007/s11104-015-2519-0
Keywords
Decanter centrifuge; Screwpress; Slurry flocculation; Pyrolysis; Combustion; Diffusive gradients in thin films (DGT)
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Funding
- Danish Council for Strategic Research [2104-09-0056]
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Aims The aim was to study effects of slurry acidification, separation technology and thermal processing on the availability of P in soil amended with the solid fraction of pig slurry. Methods Acidified and non-acidified slurry were separated using different technologies: screw press (SCR), decanting centrifuge (DEC) and drainage after chemical pretreatment (CHE). Solids and pyrolysed (400 A degrees C or 600 A degrees C, char) or combusted (625 A degrees C, ash) solids were applied to two soils, with triple superphosphate (TSP) as a reference. Soil P availability was determined over 12 weeks using diffusive gradients in thin films (DGT). Results The initial availability of P from DEC and CHE solids was similar to TSP in both soils. After 6 weeks no significant difference was observed between DEC solids and DEC chars. Acidification did not significantly affect P availability in the solids-amended soils over time, but it did affect P availability with the thermally processed materials. Conclusions Application of separated pig slurry solids generally increased soil P availability initially, but declining with time, indicating soil P fixing reactions. Chars and ashes on the other hand showed lower initial P availability, but remained constant or increased slightly with chars yielding P availability similar to solids after 12 weeks.
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