Straw-derived biochar was more effective than direct straw return in mitigating soda saline-sodic stress and improving nitrogen use efficiency in rice grown in saline-sodic fields. - Jin, Feng; Wang, Chuchu; Wang, Xudong; Song, Yang; Wang, Qingyu; Liu, Hange; Wang, Hongyue; Wu, Tao; Jiang, Wenzhu; Lan, Yu; Cao, Ting; Hou, Xinquan; et al. (Biochar, 2026)