Febriana, W., Gusmini and Yulistriani 2023. Improvement Of Ex-Gold Mining Soil Through The Application Of Rubber Leaf Litter Compost And Biochar Of Oil Palm Empty Fruit Bunches On The Growth Of Rubber Seedlings (Hevea Brasiliensis Muell. Arg.) Pb-260 Clone. Jurnal Riset Perkebunan. 4, 1 (Mar. 2023), 53–64. DOI:https://doi.org/10.25077/jrp.4.1.53-64.2023.