Hawari, Hadromy, et al. “The Role of Biochar and Combination of Inorganic Fertilizers and Biological Fertilizers in Increasing Yield and Levels of Brix Sorghum (Sorghum Bicolor (L.) Moench) in Dry Land”. Jurnal Penelitian Pendidikan IPA, vol. 7, no. 3, July 2021, pp. 437-42, doi:10.29303/jppipa.v7i3.729.