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ZUPANC, V. in sod.: Comparison of laboratory TDR soil water measurements

365

Table 3: Measurements of soil VWC TDR 100 Time Domain Reflectometer for four

different soil water contents with average VWC, coefficient of variation

(CV), standard deviation, min and max as well as range for Sand soil.

Measurement TDR 100-10a TDR 100-10b TDR 100-20a TDR 100-20b

1 10.56 9.62 6.78 6.66

2 15.38 15.20 12.81 12.29

3 19.30 21.27 18.51 18.55

Average

VWC

4 37.97 37.86 33.24 33.42

1 0.22 0.02 0.03 0.00

2 0.06 0.01 0.09 0.00

3 0.01 0.03 0.01 0.01

4 0.01 0.01 0.01 0.02

1 0.47 0.15 0.18 0.06

2 0.24 0.12 0.30 0.04

3 0.08 0.16 0.07 0.12

Standard

deviation

(VWC)

4 0.08 0.11 0.07 0.13

1 9.76 9.42 6.66 6.56

2 15.15 15.03 12.33 12.24

3 19.20 21.00 18.40 18.40

Minimum

4 37.87 37.74 33.18 33.32

1 10.93 9.75 7.09 6.72

2 15.76 15.35 13.04 12.34

3 19.40 21.40 18.59 18.65

Maximum

4 38.07 37.98 33.36 33.65

1 1.17 0.33 0.43 0.16

2 0.61 0.32 0.71 0.10

3 0.20 0.40 0.19 0.25

Range

4 0.20 0.24 0.18 0.33

Results of VWC measurements of original and replicated rod sets were compared

with gravimetrically determined VWC (Figures 3 – 14). Compared is the distribution

of the TDR measurements against gVWC (dotted line is 1:1 line, which represents

ideal situation). For Clay Loam soil original and replicated rods produced very similar

results, thou there was some scattering along 1:1 line. Both 20 cm rods

underestimated the VWC of Clay Loamy soil (dots under the 1:1 line) (Figures 3 – 6).

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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