However, comparing with the ratio 3:2 and the ratio 2:3, the ratio 2:3 degraded with 90 g corncob made better use of corncob than the ratio 3:2 with 200 g corncob, but the ratio 3:2 produced more biogas and methane than the ratio of 2:3 in the same working volume, the ratio 3:2 provided greater economic value