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

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Table 1: 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 Clay Loam soil.

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

1 16.81 18.58 7.82 11.57

2 15.88 19.30 14.04 15.20

3 20.75 20.91 17.10 17.80

Average

VWC

4 36.34 39.56 32.99 34.54

1 0.02 0.39 0.00 0.05

2 3.05 0.47 0.01 0.02

3 0.62 0.11 0.01 0.03

4 0.02 0.02 0.01 0.00

1 0.15 0.62 0.03 0.22

2 1.75 0.69 0.09 0.14

3 0.79 0.33 0.11 0.16

Standard

deviation

(VWC)

4 0.14 0.13 0.10 0.06

1 16.61 18.00 7.79 11.40

2 14.89 18.66 13.96 15.08

3 20.18 20.67 16.98 17.66

Minimum

4 36.13 39.39 32.84 34.45

1 16.97 19.52 7.86 11.94

2 19.00 20.07 14.14 15.45

3 22.14 21.47 17.27 18.00

Maximum

4 36.50 39.72 33.06 34.61

1 0.36 1.52 0.07 0.54

2 4.11 1.41 0.18 0.37

3 1.96 0.80 0.29 0.34

Range

4 0.37 0.33 0.22 0.16

In Silt Loam soil all probes gave satisfactory results for the first measurement (13,5%

gVWC ±2.49), 10b being the exception with 5.3% VWC deviation. For the second

measurement (21% gVWC ±2.03) the best results gave 10a rods with only 1.2%

VWC deviation. In the third measurement (34.1% gVWC ±1.25) all rods gave lower

values than those determined by Gravimetric method. 10a rods deviated for 1.8%

VWC and 10b 2.8% VWC and 20a 2% VWC. 20a rods showed big standard deviation

±1.61. Both 10a and 10b gave good results for the fourth measurement (42.6% gVWC

±0.45). 10a deviated for 0.7% VWC and 10b for 1.7% (Table 2).

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