CARNEIRO, J.P. [et al.] (2014) - Nitrogen use efficiency in a soil amended with different organic residues. In Nitrogen Workshop, 18, Lisboa, 30 junho-3 julho - The nitrogen challenge : building a blueprint for nitrogen use efficiency and food security : proceedings. Lisboa : ISA. p. 48-49. Comunicação
Title
Nitrogen use efficiency in a soil amended with different organic residues
Subject
Nitrogen efficiency Soil
Date
2014-10-22T14:40:40Z 2014-10-22T14:40:40Z 2014
Description
Nitrogen efficient use is important for economic and environmental sustainability of cropping
systems. Three examples of fertilization practices considered to be able to contribute to the
improvement of N use efficiency are: the use of a waste with higher C/N ratio, such as pulp mill
sludge (Kirchmann and Bergström, 2003), specific application time and/or split application of
nitrogen fertilizers (Roberts, 2008) and the use of nitrification inhibitors, such as the DCD (Zaman
and Blennerhassett, 2010). In present study a field experiment was carried out from May 2006 to
May 2008, in central Portugal, to evaluate agronomic nitrogen use efficiency (AE) and apparent
N recovery efficiency (ARE), when different organic wastes (cattle slurry, sewage sludge and
urban waste compost) were used as N sources in a double-cropping system producing maize and
oats forage. The use of a nitrification inhibitor (DCD), the splitting application of residues and the
use of an organic residue with high C/N ratio (pulp mill sludge) were evaluated as management
practices that could improve N use efficiency.
