Aerobic composting and vermicomposting processes were compared in the co-composting of durian shells citrus peels. For decomposers, microorganism catalyst from Land Development Department, i.e., LDD1 catalyst, earthworms used. The moisture contents peels 84.6% 77.3%, respectively, pH relatively low, as these are sources potassium. experiments utilized four different reactors: (100%) reactor 1; ...