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中文摘要：
根据甘肃张掖2007年田间试验数据，利用Penman—Monteith公式和农田水量平衡法，计算了春小麦、春玉米、马铃薯三种单作种植模式的需水特征和作物系数。结果表明：不同种植模式需水量不同，充分灌溉下，春玉米需水量最大，各种植模式需水模比系数最大值均出现在作物生育后期；从全生育期作物系数平均值来看，春玉米（0．96）〉春小麦（0．84）〉马铃薯（0．83），作物系数最大值均出现在作物生育中后期，各种植模式作物系数在生育期内明显呈现“单峰”变化趋势。
英文摘要：
According to the data of the field tests conducted in 2007 in Zhangye area of Gansu province, by using Penman - Monteith formula and water balance method of farmland, the article calculated the water requirement and crop coefficient of spring wheat, spring corn and potato in monoculture pattern. The result showed that： the water requirement were different among the three planting patterns, water requirement of spring corn was the highest under sufficient irrigation, the maximum of water requirement coefficient all appeared in the later period of crops growth and development; so far the average crop coefficient in the whole growth period as considered, there was the following order： spring corn （0.96） 〉 spring wheat （0.84） 〉 potato （0.83）. The maximum of crop coefficient all appeared in the middle -later period of crops development. ＂Single peak＂ type changeable tendency of crop coefficient in the whole growth period was obviously presented.
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