Long-term straw return and nitrogen management enhance wheat grain Zn biofortification through rhizosphere microbial-mediated Zn mobilization in calcareous soils - Shiyu Peng; Xiaoli Hui; Nannan Li; Min Zhang; Xianfeng Zheng; Zhaohui Wang; Laichao Luo; Yinglong Chen (Soil and Tillage Research, 2026)