该文根据甘肃张掖气象站1991~2000年的气象资料，利用Hargreaves公式和Penman-Monteith公式计算了参照作物需水量（ET0）。
According to the climate data from 1991 to 2000 at Zhangye weather station , using Hargreaves equation and Penman-Monteith equations , the reference crop evapotranspiration ( ET_0 ) was calculated .
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