Sanjaya, R., R. Riwandi, and H. Hasanudin. “Enhancing Leaf Potassium and Corn Yield in Degraded Ultisols With Vermicompost Fertilizer”. TERRA : Journal of Land Restoration, vol. 6, no. 2, Dec. 2023, pp. 89-93, doi:10.31186/terra.6.2.89-93.