matter in cattle manure to methane decreased as the
organic loading increased. It was earlier seen from the
mixing ratio of 0.5:5 tested data not shown, that the
variation of NH3-N concentration had no obvious variation
and maintained below 500 mg/l. At the end of the
experiment, NH3-N was reduced to 87% which is 20%
higher than that at mixing ratio 1:5 and 1.5:5.