From sludge to sustained-release biochar-based phosphorus fertilizer: CaO-mediated phosphorus transformation, soil amelioration, and agronomic performance across contrasting soil types - Zhengkang Zou; Xiaoxiao Xu; Sha Liang; Beibei Dou; Wenbo Yu; Huabo Duan; Jiakuan Yang; Xiong Shi (Biomass and Bioenergy, 2026)