Syaifudin, A., Buchari, H., Prasetyo, D., & Lumbanraja, J. (2022). Effect of Manure and Biochar Treatment on Soil Respiration and Corn (Zea mays L.) Production in Ultisol Soil. Journal of Tropical Upland Resources (J. Trop. Upland Res.), 4(2), 56-68. https://doi.org/10.23960/jtur.vol4no2.2022.141