Relationship between Summer Maize Yield and Climatic Factors in Rain-feed Region of Southern Henan

Based on the data of summer maize yield and agricultural climate information in Fangcheng and Xiping counties (rain-feed region) of southern Henan province from 1995 to 2008,the effects of climate factors (temperature,rainfall and illumination hour) on the meteorological yield of summer maize were studied.The result showed that the rainfall was the main factor affecting the maize production during the whole maize growing period,followed by the temperature,and then the illumination hour.The rainfall in June and August and the temperature in July were the key factor affecting the summer maize yield.