Budianta, Dedik, Ali Yasmin Adam Wiralaga, and Wahana Lestari. “Changes in Some Soil Chemical Properties of Ultisol Applied by Mulch from Empty Fruit Bunches in an Oil Palm Plantation”. JOURNAL OF TROPICAL SOILS 15, no. 2 (April 10, 2018): 111–118. Accessed August 1, 2025. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/47.