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中文摘要：
依据1999—2003年五年田间试验资料，利用Penman-Montheith公式计算陕西关中地区夏玉米全生育期内参考作物蒸发蒸腾量，并利用大型称重式蒸渗仪监测夏玉米全生育期内作物实际蒸发蒸腾量，由此计算了夏玉米各生育阶段的作物系数，并分析了作物系数变化规律。结果表明：在陕西关中地区的气象条件下，夏玉米的参考作物蒸发蒸腾量平均为346．87mm，实际蒸发蒸腾量平均为350．86mm，作物系数在全生育期内呈单峰变化，峰值出现在抽穗～灌浆期之间平均为1．27，同时夏玉米的作物系数与种植后天数和大于10℃积温呈现良好的三次多项式和二次多项式关系。
英文摘要：
According to the meteorological data between the year 1999 to 2003 of Guanzhong Region in Shaanxi province, the reference crop evapotranspiration of summer maize during various growing periods is calculated out by adopting the formula of PenmanMonteith. With the comparison to the data obtained through large-scale weighing lysimeter, the variation of the crop coefficient of different growing periods is analyzed. The result implies that the average reference crop evapetranspiration during crop growing stage in Guanzhong region is 346.87 mm,whiie the actual crop evapetranspiration is 350. 86 mm. The summit of the crop coefficient is observed in the whole growth period, which is 1.27 and appears in the heading-filling period. At the same time , there are good third-order polynomial and second-order polynomial relations between Kc and the days after planting and the cumulative temperature above 10 ℃, respectively.
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