Figure 3. Simulated grain yield in rainfed maize expressed as a percentage of that in irrigated maize combinations of two kinds of varieties (those planted in the 1980s and 2000s) and for two climates (the 1980s and 2000s) 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.