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介绍了时域反射仪（ＴＤＲ）测定农田土壤水分的方法及其应用，包括测定农田根系层土壤含水量和一定深度范围内土体贮水量，ＴＤＲ自动、连续监测土壤水分，用ＴＤＲ实测土壤水分来估算作物不同生长发育期内农田实际蒸散量以及用于探讨农田水分空间变异性。还对ＴＤＲ、中子仪和土钻法测定的土壤含水量进行了比较，结果表明，应用ＴＤＲ测定农田土壤水分要优于中子仪和土钻法。
This paper introduces the method and its application of time domain reflectometer (TDR) to measure the soil moisture in farmland, including measuring the soil moisture in the root layer of farmland and the soil water storage within a certain depth range. TDR automatically monitors the soil moisture continuously. TDR measured soil moisture To estimate the actual evapotranspiration of farmland in different crop growth and development stages and to explore the spatial variability of farmland moisture. The soil moisture content measured by TDR, neutron meter and soil drilling method was also compared. The results showed that soil moisture of farmland was better than neutron detector and soil drilling method by TDR.