Jan 4, 2023 · Purpose This study aimed to assess Epimedium herba residue (EHR) as a bulking agent for lignite and spent mushroom substrate (SMS) co-composting to develop a soil amendment/fertilizer as an alternative to current management practices (disposal in landfalls). Composting was performed in a 150-L composting box using different ratios of EHR (0, 10%, 20% and 30% of the sum of lignite and