| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 692.9 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Cattle-slurry (liquid manure) application to soil is a common practice to provide nutrients and organic
matter for crop growth but it also strongly impacts the environment. The objective of the present study
was to assess the efficiency of cattle-slurry treatment by solideliquid separation and/or acidification on
nitrogen dynamics and global warming potential (GWP) following application to an acidic soil. An aerobic
laboratory incubation was performed over 92 days with a Dystric Cambisol amended with raw
cattle-slurry or separated liquid fraction (LF) treated or not by acidification to pH 5.5 by addition of
sulphuric acid. Soil mineral N contents and NH3, N2O, CH4 and CO2 emissions were measured. Results
obtained suggest that the acidification of raw cattle-slurry reduced significantly NH3 emissions ( 88%)
but also the GWP ( 28%) while increased the N availability relative to raw cattle-slurry (15% of organic N
applied mineralised against negative mineralisation in raw slurry). However, similar NH3 emissions and
GWP were observed in acidified LF and non-acidified LF treatments. On the other hand, soil application of
acidified cattle-slurry rather than non-acidified LF should be preferred attending the lower costs associated
to acidification compared to solideliquid separation. It can then be concluded that cattle-slurry
acidification is a solution to minimise NH3 emissions from amended soil and an efficient strategy to
decrease the GWP associated with slurry application to soil. Furthermore, the more intense N mineralisation
observed with acidified slurry should lead to a higher amount of plant available N and consequently
to higher crop yields.
Description
Keywords
Solideliquid separation Ammonia Methane Nitrous oxide Carbon dioxide Slurry acidification
Citation
Fangueiro, D., Pereira, J., Bichana, A., Surgy, S., Cabral, F., Coutinho, J., 2015. Effects of cattle-slurry treatment by acidification and separation on nitrogen dynamics and global warming potential after surface application to an acidic soil. Journal of Environmental Management 162, 1-8.
Publisher
Elsevier