Zahrah, Siti, and Nursamsul Kustiawan. “Applications of Oil Palm Ash and Various Types of Organic Fertilizer on Acid Soil (Ultisol) for Onion (Allium Ascalonicum L)”. JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) 4, no. 2 (July 1, 2022): 169-183. Accessed April 26, 2025. https://ejournal.uniks.ac.id/index.php/JUATIKA/article/view/2315.