Do Effective Micro-Organisms Affect Greenhouse Gas Emissions from Slurry Crusts?

Mohd Saufi B. Bastami, Malaysian Agricultural Research and Development Institute (MARDI), Ibu Pejabat MARDI, Persiaran MARDI-UPM, 43400 Serdang Selangor, Malaysia, David R. Chadwick, Davey L. Jones
2016 Journal of Advanced Agricultural Technologies  
Slurry crusts form on the slurry surface and act as a primary barrier to gaseous emissions and could also be a zone where CH 4 is consumed by methane-oxidising bacteria present. However, slurry crusts have also been reported as sources of nitrous oxide emissions. This study evaluated methane oxidation rate and nitrous oxide emissions from a 8 months developed slurry crust followed by 8 weeks application of a mixed microbial consortia (effective microorganism; EM ® ). There was no clear evidence
more » ... s no clear evidence of CH 4 oxidation following EM ® application. Whilst there was no significant reduction of N 2 O fluxes from EM ® -treated crusts, there was a tendency for lower N 2 O emissions from EM ® -sprayed crusts. N 2 O emissions were greater than CH 4 consumption, resulting in net greenhouse gas (GHG) emissions of between 13.8-46.7 mg CO 2 eq. g -1 DM hr -1 . We conclude that it is important to consider net GHG emissions (CO 2 eq.) when reporting CH 4 oxidation from slurry crusts. 
doi:10.18178/joaat.3.1.49-53 fatcat:jvxpn4i57nh6bmmaaxtle43csm