Manullang, Frisca Anggriani, Iskandar Lubis, and Munif Ghulamahdi. “Response of Growth and Yield of ‘IPB 9G’ Rice to The Application of NPK and Biofertilizers”. Journal of Tropical Crop Science 12, no. 01 (February 28, 2025): 70–76. Accessed May 23, 2025. https://j-tropical-crops.com/index.php/agro/article/view/735.