Handajaningsih, Merakati, Marwanto ‎, Frederika Verna Purdiah Ningrum, and Priyono Prawito. “Plant Growth-Promoting Potential of Oil Palm Boiler Ash-Based Organomineral Fertilizer for Green Mustard Cultivation Under Reduced Urea Dose in Ultisols”. KnE Social Sciences 9, no. 26 (October 2, 2024): 96–104. Accessed February 6, 2025. http://thrillriftranks.com/index.php/KnE-Social/article/view/17073.