Fig 4. Crop resilience of spring wheat, naked oat, potato, and maize in warm-wet environment (black dot) and warm-dry environment (red dot).

A, C and E is spring wheat, naked oat and potato in Wuchuan, respectively. B, D and F is spring wheat, potato and maize in Guyuan, respectively. Minimum (WUEmin) and maximum (WUEmax) (slope of the Yield/ET) in the wetter and drier years, respectively, are based on all crops for multi-year study periods. The insets illustrate the differences in WUEmin and WUEmax with mean Tmax, Tmin, PDSI, and fertilizer for each study periods. Columns labeled with the different letter are significantly different (P<0.05).