Abstract: Background and Objective: Mung bean is one of the most important food legume crops in Indonesia which contains balanced nutrients. Increasing mung bean productivity is currently directed at sub-optimal lands due to limited fertile land, including acid land. Optimization of growth and production of mung beans in acid land can be done by providing organic matter. The study aims to identify the effect of dried decanter solid (DDS) and arbuscular mycorrhizal fungi (AMF) application on the growth and production of mung bean plants in acid lands. Materials and Methods: This research was conducted at Kopertis Growth Center Region I, Deli Serdang Regency, North Sumatra Province, Indonesia. This research was conducted using a factorial randomized block design (RBD), with two factors. The first factor is dried decanter solid consisting of 4 levels, namely 0, 150, 300 and 450 g/polybag. The second factor is arbuscular mycorrhizal fungi consisting of 4 levels, namely 0, 6, 12 and 18 g/polybag. Results: The application of dried decanter solid 300 g/polybag significantly increased plant height, the number of branches and seed weight per plot, besides the application of dried decanter solid 450 g/polybag significantly increased root length. Conclusion: Dried decanter solids can be used to optimize the growth and production of mung bean in acid lands.