Calibration and verification of Frequency Domain Reflectometry to measure soil water content
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DOI：10.7606/j.issn.1000-7601.2008.04.07
Key Words: FDR  soil water content  calibration
Author NameAffiliation
LU Guohua College of Resources and Environmental Sciences China Agricultural University，Beijing 10094，China 
LI Zizhong College of Resources and Environmental Sciences China Agricultural University，Beijing 10094，China 
ZHAO Bingxing College of Resources and Environmental Sciences China Agricultural University，Beijing 10094，China 
ZHAO Xiaoyan Management of fice of the Summer Palace，Beijing 10091，China 
XIAO Zhiguang Management of fice of the Summer Palace，Beijing 10091，China 
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Abstract:
      Frequency Domain Reflectometry （FDR） is an effective instrument of measuring soil volumetric water content but it need a good calibration. The experi ments were carried out to calibrate FDRin the lab and field and calibration equations were verified by oven-dried method for soil samples obtained by augers. The result showed that good calibrating equations with average RMSE 0．023m3／m3 were fitted in the lab but they had poor RMSE 0．066m3／m3 when used in the field. Other calibrating equations with average RMSE 0．026 m3／m3 were also fitted by indirect field calibration method and they had good RMSE 0．026 m3／m3 when used in the field. Therefore theindirect filed calibration method can be usedin complex soils in a garden or a city to avoid destroying soil.
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