摘要： 在作物与水分关系研究中，产量是确定耗水量的重要因子，但不是唯一因子，要同时考虑水分利用效率和经济效益。本文在试验资料的基础上，研究了夏玉米产量和耗水量的关系，运用最优分割理论对水水利用效率进行最优分割：同时对不同水分处理的籽粒产量、秸秆产量、水分利用效率和灌水费用等进行综合评判，进而确定夏玉米耗水量指标。然后对不同生育阶段耗水规律和降水时间分布进行了分析。为夏玉米田间水分管理和进行气候评价提供依据。

关键词: 夏玉米, 耗水量, 耗水规律

Abstract: In the study of crop-water relations,the yield is important to determine the water consumption.But it is not the only factor.It is also necessary to take account of the water use efficiency(WUE)and the economic benefit.According to the experiment in 1984-1986,the paper analysed the relationship between yield and water consumption for summer corn and made the optimum segmentation to the WUE.It also multievaluated the different water treatments from grain yields,stalk yields,WUE and irrigation costs and determined the optimum treatment.Thus the water consumption for summer corn can be obtained.The water consumption and the precipitation in different stage are analysed.It is useful to the water management for summer corn and to the climatical evaluation.

Key words: Summer corn, Water consumption, Law of water consumption