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Verification of TDR and FDR Sensors for Volumetric Soil Water Content Measurement in Sandy Loam Soil  

Hur, Seung-Oh (Soil Management Division, National Institute of Agricultural Science & Technology, RDA)
Ha, Sang-Keun (Soil Management Division, National Institute of Agricultural Science & Technology, RDA)
Kim, Jeong-Gyu (Division of Environmental Science and Ecological Engineering, Korea University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.42, no.2, 2009 , pp. 110-116 More about this Journal
Abstract
This study was to verify and calibrate seven kinds of soil water sensors for volumetric soil water content(VSWC) measurement under field. Types of sensors were TDR (Time Domain Reflectometry) and FDR(Frequency Domain Reflectometry). Two kinds of TDR were TRIME(profile type), and Mini-TRASE(rod type). Five kinds of FDR were EasyAG, EnviroSCAN, PR-1(profile type), and WET-1(rod type). VSWC by TRIME and Mini-TRASE compared with VSWC by soil core showed the standard error of about 2.4%, and 1.4% which is the smallest value among all the sensors used in the experiment, respectively. The errors of EasyAG and EnviroSCAN analyzed with scaled frequency(SF) were about 2.6%, and 2.8% and those by 1 versus 1 correspondence were about 2.6%, and 2.6%, respectively. WET-1 showed about 2.0% of error, which is the smallest value among errors by FDR sensors. PR-1 with the error of about 4.7% should be hard for application in field. Therefore, users on soil water sensors have to take into consideration the errors of sensors revealed after the calibration for the correct measurement of VSWC in field. The rest except for PR-1 among the sensors could be used for VSWC measurement with 1.4~2.6% error.
Keywords
Volumetric Soil Water Content; Soil Water Sensor; TDR; FDR;
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