B. Basyaruddin, “Application of Sludge and Manure on Subsoils as Medium of Palm Oil Seedling (Elaeis guineensis Jacq)”, IJSBAR, vol. 32, no. 2, pp. 95–104, Mar. 2017, Accessed: Jul. 26, 2026. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6957