Coordinated optimization of regulated deficit irrigation and controlled release urea ratio to enhance water-nitrogen coupling and winter wheat yield stability in ridge-furrow systems - Guangxin Zhang; Xufang Wang; Liqun Bao; Yanan Jiao; Dehao Zhao; Xiaoxia Wen; Juan Han; Yan Zhang; Yuncheng Liao (Soil and Tillage Research, 2026)