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Advisor(s)
Abstract(s)
The application of untreated or treated animal manure to soils can result in increased N and C gaseous
emissions contributing to ecosystem change and global warming. In the present study, dairy cattle slurry
(liquid manure) was subjected first to pre-treatment by separation using a screw press to obtain a liquid
(LF) and a solid fraction (SF). Then, the different fractions and the whole slurry (WS) were combined with
two nitrification inhibitors (NI), dicyandiamide (DCD) or 3,4-dimethylpyrazole phosphate (DMPP), were
applied to soil to assess the effect of slurry treatment by separation and NI addition on soil N dynamics
and CH4, CO2, NH3, NO and N2O emissions.
The WS and the two slurry fractions, combined or not with DCD or DMPP, were applied to soil at an
equivalent field dosage of 120 kg total N haÿ1
. Controls including a soil only, soil–DCD and soil–DMPP
treatments were also included. The mixtures were incubated for 93-d at 20 °C.
Results obtained show that NI inhibited nitrification between 16 and 30-d in WS and LF, with DMPP
having a longer effect over time compared to DCD. There was no significant effect of NI on nitrification
for the SF treatment. Nitrification inhibitors did not significantly affect (P > 0.05) the CH4, CO2 and N2O
emissions, but significantly decreased (P < 0.05) NO emissions. Furthermore, the two NIs had a similar
effect on gaseous emissions. Throughout the entire experiment, the greatest amount of NO was released
from the LF treatment (without NI), while the greatest amount of N2O was released from the SF treatment. Slurry separation had no impact on N emissions, while the combination of this process with one
of the two NI led to a small reduction in total N emissions.
Description
Keywords
N dynamics gaseous emissions cattle slurry
Citation
Pereira J., Fangueiro D., Chadwick D.R., Misselbrook T.H., Coutinho J., Trindade H., 2010. Effect of cattle slurry pre-treatment by separation and addition of nitrification inhibitors on gaseous emissions and N dynamics: A laboratory study. Chemosphere 79, 620-627.
Publisher
Elsevier