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Acta agriculturae Slovenica, 85 - 2, november 2005

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Comparison of the TDR 100 measurements and gravimetrically determined VWC

(Figure 4) for Silt Loamy soil shows the best agreement with Gravimetric method for

10 cm original rods, whereas replicated 10 cm rods slightly over and underestimated

VWC. Both original and replicated 20 cm rods underestimated the VWC of silt

Loamy soil (dots under the 1:1 line) (Figures 7 – 10).

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Gravimetric Method (Vol %)

Sensor Measurements (Vol %)

TDR 100 10a

Figure 7: Comparison of Gravimetric method vs. TDR 100 Water Content

Reflectometer measurements of soil volumetric water content for 10 cm

original rods for Silt Loamy soil. The dotted line is 1:1 line.

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Campbell TDR Bedienungsanleitung Seite 10