Kusumaningayu, R.R.R., Mustafa, I., Siswanto, D., Suharjono, S., Ardyati, T. and Jatmiko, Y.D. 2025. Evaluation of a non-aseptic stepwise culture technique with various carbon sources for nitrogen-fixing bacteria propagation. Berkala Penelitian Hayati. 31, 1 (Apr. 2025), 60-65. DOI:https://doi.org/10.23869/bphjbr.31.1.20259.