玉米是一种适应性很强的高产作物,在我国南北方均有种植。河南由于气候条件优越和轮作倒茬的关系,多种植夏玉米,生长期约90天上下。目前由于工农业发展的要求和人口的增长,水资源不足的矛盾日益突出,节约用水,经济用水成为农业生产上一个中心问题。研究干旱对夏玉米需水量和产量的影响,提出夏玉米干旱减产百分数和各生育期土壤水分指标,作为节约用水和经济用水的科学依据,也是实现高、稳、优、低的依据。三年试验,高产夏玉米需水量为250～300立方米/亩。干旱减产百分数其趋势为苗期<拔节期<抽雄开花期>灌浆期 Corn is a highly adaptable high-yield crop that is planted in both northern and southern China. Henan Province, due to the superior climatic conditions and the rotation of the crop rotation, planting more summer corn, the growth period of about 90 days up and down. At present, due to the requirements of industrial and agricultural development and the growth of population, the contradiction between water resources has become increasingly prominent. Water conservation and economic use of water have become a central issue in agricultural production. To study the effect of drought on water requirement and yield of summer maize, the percentage of drought and yield reduction of summer maize and soil moisture index of each growth period were put forward as the scientific basis for saving water and economic water, which is also the basis for realizing high, stable, superior and low yield. Three years of trial, high-yield summer maize water demand of 250 to 300 cubic meters / mu. The trend of drought reduction percentage was seedling stage filling stage