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), pp. 53–64. doi: 10.25077/jrp.4.1.53-64.2023.