“Effect of CaCO3, Humic Acid, and Arbuscular Mycorrhizal Applications on Soybean Growth in Ultisol of Sijunjung, West Sumatra”. 2024. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 52 (1): 110-21. https://doi.org/10.24831/jai.v52i1.53751.