Figure 2. Simulated combined effects of variety (varieties planted in the 1980s vs. 2000s) and climate (climate in the 1980s vs. 2000s) on grain yield in rainfed maize and in irrigated maize for the entire Chinese Maize Belt (CMB) and for three regions (NE, NCP, and SW) in the CMB.

NE, NCP, and SW refer to Northeast China, the North China Plain, and Southwest China, respectively. Error bars indicate one standard deviation.