AgriFM: A multi-source temporal remote sensing foundation model for Agriculture mapping - Wenyuan Li; Shunlin Liang; Keyan Chen; Yongzhe Chen; Han Ma; Jianglei Xu; Yichuan Ma; Yuxiang Zhang; Shikang Guan; Husheng Fang; Zhenwei Shi (Remote Sensing of Environment, 2026)