Stage-specific causal effects of flash drought on summer maize phenology and its spatiotemporally heterogeneous responses in the Huang-Huai-Hai Plain, China - Kaixuan Zhang; Weifo Xiao; Shaowei Ning; Jialu Wu; Yuliang Zhou; Xiaoyan Xu; Le Chen; Yi Cui; Juliang Jin (European Journal of Agronomy, 2026)