Optimizing fertilization depth for yield improvement and ammonia mitigation in double-cropping rice - Xianjin Lan; Dali Song; Wei Zhou; Zhenzhen Lv; Jianhua Ji; Hongqian Hou; Jingshang Xiao; Yiren Liu; Xiumei Liu; Gang Sun; Guangrong Liu; Chunhuo Zhou (Field Crops Research, 2026)