Doubling CO 2 Modulates Root Morphology to Enhance Maize Elemental Stoichiometry and Water Use Efficiency Under Soil Drought and Salinity. - Xu, Changtong; Tong, Haoran; Gao, Zesen; Zhao, Wentong; Liu, Chunshuo; Zhang, Manyi; Wei, Zhenhua (Agronomy, 2026)