Greenhouse gas emissions from land application of manure
Date
2010-03-25
Authors
Agnew, J.
Lague, C.
Schoenau, J.J.
Farrell, R.E.
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Abstract
Greenhouse gas (GHG) emissions from agricultural activities such as land application of
livestock manure cannot be ignored when assessing overall emissions from anthropogenic
sources. The magnitude of these emissions will be influenced by management practices such as
manure placement during land application. The objective of this work was to compare GHG
fluxes resulting from the surface and subsurface application of liquid and solid manure. For this
comparison, all measurements were made 24 hours after application. The results showed that
subsurface application significantly increased carbon dioxide equivalent (CO2-e) fluxes for both
solid and liquid manure. The overall CO2-e fluxes from the injected treatments were 3.2 times
higher than CO2-e fluxes from the surface applied plots, mainly due to a pronounced increase in
N2O fluxes which was likely caused by increased denitrification rates. The CO2-e fluxes from the
liquid manure applications were also higher than the CO2-e fluxes from the solid manure
applications, probably due to higher levels of ammonium available for nitrification and
subsequent denitrification. For this particular study, the measured specific fluxes (total flux per
kg N applied) remained relatively constant with application rate, indicating that GHG emissions
from manure applications were approximately proportional to the amount of land applied
manure.
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Keywords
manure spreading, broadcast, injection, denitrification, liquid manure, solid manure
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Soils and Crops Workshop