“MEASURING SOIL FERTILITY LEVELS AND SOIL ACIDITY FOR THE SUITABILITY OF PALM OIL PLANTING IN WEST PASAMAN WITH THE APPLICATION OF THE FUZZY INFERENCE SYSTEM”. Jurnal Ipteks Terapan 17, no. 4 (December 31, 2023): 973–988. Accessed August 5, 2026. https://publikasi.lldikti10.id/index.php/jit/article/view/2917.