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Comparison of N losses ( $NO_3^ - $ , N₂O, NO) from surface applied, injected or amended (DCD) pig slurry of an irrigated soil in a Mediterranean climate
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Comparison of N losses ( $NO_3^ - $ , N₂O, NO) from surface applied, injected or amended (DCD) pig slurry of an irrigated soil in a Mediterranean climate
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Journal Article
Comparison of N losses ( $NO_3^ - $ , N₂O, NO) from surface applied, injected or amended (DCD) pig slurry of an irrigated soil in a Mediterranean climate
2005
Overview
Nitrous oxide (N₂O), nitric oxide (NO), denitrification losses and $NO_3^ - $ leaching from an irrigated sward were quantified under Mediterranean conditions. The effect of injected pig slurry (IPS) with and without the nitrification inhibitor dicyandiamide (DCD) was evaluated and also compared with that of a surface pig slurry application (SPS) and a control treatment (Control) without fertiliser. After application, fluxes of NO and N₂O peaked from SPS (3.06 mg NO-N m⁻² d⁻¹ and 108 mg N₂O-N m⁻² d⁻¹) and IPS (3.50 mg NO-N m⁻² d⁻¹ and 105 mg N₂O-N m⁻² d⁻¹). However, when irrigation was applied, N₂O and NO emissions declined. The total N₂O and denitrification losses were slightly large from IPS than from SPS, although the differences were not significant (P < 0.05). Emission of NO was not affected by the method of pig slurry application. DCD inhibited nitrification during the first 20-30 days and reduced N₂O and NO emissions from pig slurry by at least 46% and 37%, respectively. Considering the 215 days following pig slurry application, the emission factor of N₂O based on N fertiliser was 1.60% (SPS), 2.95% (IPS), and 0.50% (IPS + DCD). The emission factor for NO was 0.14% (SPS), 0.12% (IPS), and 0.02% (IPS + DCD). Environmental conditions of the crop favoured the denitrification process as the most important source of N₂O during the experimental period. The differences in the denitrification rate between treatments could be explained by the pattern of water soluble carbon (WSC), that was the highest value in injected pig slurry (with and without DCD). Due to low drainage (5% of water applied), leaching losses of $NO_3^ - $ were lower than those of denitrification from the upper soil layer (0-10 cm) in all treatments and especially with IPS + DCD, where the nitrification inhibitor was very efficient in reducing leaching losses.
Publisher
Springer
Subject
/ Agronomy. Soil science and plant productions
/ Biological and medical sciences
/ Fundamental and applied biological sciences. Psychology
/ General agronomy. Plant production
/ Leaching
/ Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries
/ Slurries
/ Soil-plant relationships. Soil fertility. Fertilization. Amendments
