Deficit Subsurface Drip Irrigation Improves Water Use Efficiency and Stabilizes Yield by Enhancing Subsoil Water Extraction in Winter Wheat oleh Ming-Da Yang, Shah Jahan Leghari, Xiao-Kang Guan, Shou-Chen Ma, Chao-Ming Ding, Fu-Jian Mei, Li Wei, Tong-Chao Wang