Ichpan Zulfansyah, Fuad, Nurhayati, and Nor Azma Yusuf. “THE EFFECT OF PALM OIL SHELL BIOCAR AND P AND K FERTILIZER ON THE GROWTH AND PRODUCTION OF SOYBEAN PLANTS (Glycine Max)”. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) 3, no. 7 (June 29, 2024): 2891–2898. Accessed September 11, 2025. https://ijset.org/index.php/ijset/article/view/1072.