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A greenhouse experiment on a pea�spring wheat�potato (Pe�Sw�Po) rotation system was conducted at the Guyuan Experimental Station (lat. 36°02'N, long. 106°28'E), in a semiarid region of China, during 2000�2005. The mean daily temperature was designed to increase 0.5�2.0 °C, in the Pe�Sw�Po rotation system. When mean daily temperature increased by 1.2 °C, water use efficiency (WUE) decreased by 7.3%, the summed length of the growing period of the rotation was shortened by 23 days, and the total yield of the rotation decreased by 7.8%. With a 2.0 °C increase, WUE decreased by 12.5%, the growing period was shortened by 42 days, and the total yield decreased by 9.4%. Supplemental irrigation was beneficial to crop yields in the rotation with temperature increase. With 130 mm of supplemental irrigation spread over all growth stages and a 0.5�2.0 °C in mean daily temperature, the total yields of all crops improved by 8.3�12.7%. Consequently, in this region, supplemental irrigation may play an important role in maintaining yields of crops in a Pe�Sw�Po rotation system affected by climate warming.
