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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/2618

Title: Influence of the particle size and animal slurry type on the potential of nitrogen mineralization after soil incorporation
Authors: Fangueiro, D.
Gusmão, M.
Grilo, J.
Vasconcelos, E.
Cabral, F.
Keywords: animal slurry
nitrogen mineralization
soil incorporation
particle size
Issue Date: Sep-2010
Publisher: Cordovil, C. e Ferreira, L.
Abstract: Animal manures are rich in organic matter and nutrients, namely nitrogen (N) and, consequently, widely applied to soil as organic fertilizers. However, a large part of the nitrogen contained in animal manures is in the organic form and so not directly available for plants. Indeed, organic N has to be mineralized prior to plant uptake (Rees and Castle, 2002). Several manure characteristics as the C:N ratio (Chadwick et al., 2000), the lignin content (Kristensen, 1996) and the NH4 +/organic N ratio (Beauchamp and Paul, 1989) have been suggested as indicators of the plant-available N. More recently, Fangueiro et al. (2008) showed that the potential of N mineralization (PNM) of cattle slurry is inversely correlated with slurry particle size: finest fractions are the particle-size fractions from which N mineralization occurs in slurries whereas coarser fractions are associated with immobilization. Furthermore, Moller et al. (2002) reported that animal diet and anaerobic decomposition during storage in slurry channels and stores affect the slurry particle size distribution. Such information is of great interest since the finest slurry particle size should infiltrate the soil more easily and quickly relative to the coarser slurry particle size that should remain close to soil surface. Furthermore, mechanical slurry separation is now performed in many pig and dairy farms in order to improve slurry management in terms of nutrients utilization and reducing costs related to slurry storage. Slurry separation by screw press leads to a nutrient rich organic solid fraction (0.7– 3.2 mm particles) that may be composted and a liquid fraction that can be used for fertigation. In the present study, three types of slurry (pig, duck and cattle) were separated into 4 slurry particle size fractions (>2000 um, 2000-500 um, 500-100 um, <100 um) in order to assess the influence of the type of slurry and slurry particle size on the PNM after soil incorporation.
Description: RAMIRAN International Conference
URI: http://hdl.handle.net/10400.5/2618
ISBN: 978-972-8669-47-8
Appears in Collections:DQAA - Comunicações em Actas de Conferências

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