Post-coal mine soils have low fertility due to heterogeneous conditions, making important nutrients in the soil decrease. One of the efforts to improve post-coal mine soil is by applying vermicompost-biochar and humic acid-biochar. This study aims to determine the effect of vermicompost-biochar and humic acid-biochar with the best dose on the nursery of sengon laut (Paraserianthes falcataria) p…