The results showed that Napier Grass with harvesting 45 day effective biogas production high was 208 liters per kilogram volatile solids into the system. Followed by Napier Grass was 35 days, biogas production, 111Napier Grass with age and 55 days, biogas production in the end of 83 liters per kilogram ของแข็งระเหย into the system.
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