Feb 1, 2020 · From Fig. 1, we find the quantity of biogas produced at different temperatures, substrates and different ratios of chicken manure with sawdust to pre-treated or ordinary wheat straw during a 21 days period of anaerobic fermentation (abbreviations: CMS:S - Chicken Manure with Sawdust to ordinary wheat Straw, CMS:P.o. - Chicken Manure with