Each experiment contained about
30% inoculums. However, ratios between corncob and PM (based
on VS) were 5:2, 2:1, 3:2, 1:1 and 2:3, with constant 150 g of PM
with inoculums, filled water into glass bottles until 2000 g.
Meanwhile, there was a control with 150 g of PM with inoculums
in glass bottle. Then put all the experiments in water bath and controlled
the temperature at 35 ± 2C for anaerobic fermentation