ENZYME ACTIVITY IN RELATION TO TOTAL K, Ca, Mg, Fe, Cu AND Zn IN THE OIL PALM RHIZOSPHERE OF RIAU’S PEATLANDS, INDONESIA. BIOTROPIA [Internet]. 2018 Sep. 26 [cited 2026 Sep. 23];25(3):211-23. Available from: https://journal.biotrop.org/index.php/biotropia/article/view/862