purba, mahardika. “KARAKTERISTIK SIFAT KIMIA TANAH DI BAWAH TEGAKAN KELAPA SAWIT DI PT. PP. LONDON SUMATRA INDONESIA, TBK (SEI MERAH ESTATE)”. Agroprimatech 2, no. 2 (October 30, 2021): 46–57. Accessed January 21, 2026. https://jurnal.unprimdn.ac.id/index.php/Agroprimatech/article/view/774.