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简要介绍了时域反射仪（ＴＤＲ）测定土壤含水量的原理和方法，根据ＴＤＲ实测的土壤水分和农田水量平衡原理，估算了冬小麦生育期内不同供水条件下的农田蒸散量，探讨了ＴＤＲ探针不同埋设方式对测定土体贮水量以及对估算的农田蒸散量的影响，根据充分供水区测定的最大可能蒸散量、非充分供水区的实际蒸散量，以及用气象资料计算的参考作物蒸散量，分别计算了冬小麦生育期内的作物系数Ｋｃ和土壤水分胁迫系数Ｋｓ．
The principle and method of time domain reflectometer (TDR) for measuring soil water content are briefly introduced. According to the principle of soil moisture and farmland water balance measured by TDR, the evapotranspiration of farmland under different water supply conditions during winter wheat growth period is estimated. The effect of different burying methods on the determination of soil water storage capacity and estimated farmland evapotranspiration, based on the maximum possible evapotranspiration measured in the adequate water supply area, the actual evapotranspiration in the inadequate water supply area, and the reference crop evapotranspiration calculated using meteorological data , The crop coefficient Kc and soil water stress coefficient Ks of winter wheat were calculated respectively.