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The Corn Belt of Northeastern China (CBNC) accounts for about 35% of the nation’ corn production in China. In the past three decades, corn yield in CBNC have increased under changing in climate and crop management. It is important to investigate the contribution of these changing factors to the historical yield increases to improve our understanding of how we can ensure increased yield in the future. In this paper we conducted correlation and regression analyses of climate and simulated corn yield over the period 1980 to 2011 in CBNC. It was found that over three decades, the daily mean, minimum temperature and growing degree days (GDD) per ten year increased at a rate of 0.37°C, 0.47°C and 51°C, respectively. In contrast, the relative humidity and daily mean wind speed decreased gradually at a rate of 0.18 and 1.8 km day-1, respectively. Not significant change in precipitation was found, although differences between years were large. The daily minimum temperature and solar radiation were the dominant factor to corn potential production. According to a regression analysis of the corn potential yield and the climate factors, the results indicate that corn potential yield decreased 1010 and 1314 kg ha-1 for each 1°C increase growing season mean and minimum temperature, respectively; rain-fed yield declined 2819 and 2437 kg ha-1 for each increase 1°C growing season mean and maximum temperature, respectively. To further improve the potential yield of corn in the coming decades, efforts should be paid to break the potential ceiling reduce the yield gaps by breeding higher yield variety and introduction of new agricultural technology. Keywords-RZWQM; Corn Belt of Northeastern China; potential yield; yield gaps; weather descriptors

Weather Conditions Associated with Corn Simulated Yield in the Corn Belt of Northeastern China during the Past Three Decades