TY - SER AU - Li, Wenlong AU - Han, Xiaozhuo AU - Zhang, Yanyu AU - Li, Zizhen TI - Effects of Elevated Co2 Concentration, Irrigation and Nitrogenous Fertilizer Application onGrowth and Yield of Spring Wheat in Semi-Arid Areas KW - Grain Yield KW - Spring Wheat (Triticum Vulgare L.) Yields KW - Water Use Efficiency ER -