High methane yields and stable operation during anaerobic digestion of nutrient-supplemented energy crop mixtures

► Feasibility of anaerobic digestion of crops without manure was studied in lab scale. ► Nutrient addition is a prerequisite in the production of methane from energy crops. ► Nutrient addition led to high methane yields and stable operation. ► Long hydraulic retention time is a not precondition for high methane yield from crops. ► Both macro- and micronutrients served the same stabilising effect as manure.