Emissions of nitrous oxide, ammonia and methane from Australian layer-hen manure storage with a mitigation strategy applied
T. A. Naylor A C , S. G. Wiedemann B , F. A. Phillips A , B. Warren B , E. J. McGahan B and C. M. Murphy B
+ Author Affiliations
- Author Affiliations
A Centre for Atmospheric Chemistry, School of Chemistry, Faculty of Science, Medicine and Health, University of Wollongong, NSW 2522, Australia.
B FSA Consulting, PO Box 2175, Toowoomba, Qld 4350, Australia.
C Corresponding author. Email: naylort@uow.edu.au
Animal Production Science 56(9) 1367-1375 https://doi.org/10.1071/AN15584
Submitted: 14 September 2015 Accepted: 22 December 2015 Published: 22 March 2016
Abstract
Greenhouse gas and ammonia emissions are important environmental impacts from manure management in the layer-hen industry. The present study aimed to quantify emissions of nitrous oxide (N2O), methane (CH4) and ammonia (NH3) from layer-hen manure stockpiles, and assess the use of an impermeable cover as an option to mitigate emissions. Gaseous emissions of N2O, CH4 and NH3 were measured using open-path FTIR spectroscopy and the emission strengths were inferred using a backward Lagrangian stochastic model. Emission factors were calculated from the relationship between gaseous emissions and stockpile inputs over a 32-day measurement period. Total NH3 emissions were 5.97 ± 0.399 kg/t (control) and 0.732 ± 0.116 kg/t (mitigation), representing an 88% reduction due to mitigation. Total CH4 emissions from the mitigation stockpile were 0.0832 ± 0.0198 kg/t. Methane emissions from the control and N2O emissions (control and mitigation) were below detection. The mass of each stockpile was 27 820 kg (control) and 25 120 kg (mitigation), with a surface area of ~68 m2 and a volume of ~19 m3. Total manure nitrogen (N) and volatile solids (VS) were 25.2 and 25.8 kg/t N, and 139 and 106 kg/t VS for the control and mitigation stockpiles respectively. Emission factors for NH3 were 24% and 3% of total N for the control and mitigation respectively. Methane from the mitigation stockpile had a CH4 conversion factor of 0.3%. The stockpile cover was found to reduce greenhouse gas emissions by 74% compared with the control treatment, primarily via reduced NH3 and associated indirect N2O emissions.
Additional keywords: agriculture, bLs, GHG, manure, nitrogen, OP-FTIR.
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