雨养春玉米农田耗水特征研究

Water Consumption Characteristic of Spring Maize Without Irrigation

1997～ 1998年研究了春玉米在不同降水年型的耗水特征 ,并就肥力水平对产量的影响及不同降水年型的水分生产潜力开发程度进行了探讨。结果表明 ,无论是正常降水年型 ,还是干旱年型 ,春玉米在不同的生育时期耗水规律基本是一致的 ,即拔节至抽雄期是玉米的耗水高峰期。在降水正常年份 ,降水量基本能满足玉米生长的水分需求 ,提高自然降水的水分利用率是本区农业发展的主攻方向 ,科学施肥可以提高水分利用率。玉米在自然降水条件下的生产潜力还有约50

Water consumption characteristic of spring maize without irrigation in different precipitation years was studied. The impacts of fertilizer to maize yield and the exploitation degree of water potential productivity were discussed. The results showed that water consumption law of spring maize was consistent in different precipitation years for normal or drought, the joint stage to tasselling stage was the peak of water consumption. The amount of precipitation can meet the need of maize growth in normal rainfall years .In this region, the key problem for agricultural development is to enhance the rainfall use efficiency and scientific fertilization can improve the rainfall use efficiency. There is 50% rainfall potential productivity can exploit.