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Acta agriculturae Slovenica, 85 - 2, november 2005

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Table 2: 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 Silt Loam soil.

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

1 13.57 18.75 9.54 12.47

2 22.21 23.84 17.53 18.84

3 32.28 32.03 32.08 31.67

Average

VWC

4 43.23 44.28 35.07 35.08

1 0.82 0.07 0.01 0.01

2 0.04 0.01 0.00 0.01

3 0.47 0.04 2.59 0.13

4 0.01 0.02 0.09 0.01

1 0.91 0.26 0.09 0.09

2 0.21 0.08 0.05 0.08

3 0.69 0.20 1.61 0.36

Standard

deviation

(VWC)

4 0.08 0.12 0.30 0.10

1 12.96 18.72 9.44 12.37

2 21.97 23.76 17.47 18.76

3 31.91 31.94 31.17 31.28

Minimum

4 43.18 44.15 34.93 35.02

1 13.20 18.91 9.54 12.57

2 22.40 23.94 17.51 18.90

3 33.44 32.27 34.93 31.73

Maximum

4 43.34 44.23 35.03 35.08

1 0.24 0.19 0.10 0.20

2 0.43 0.18 0.04 0.14

3 1.53 0.33 3.76 0.45

Range

4 0.16 0.08 0.10 0.06

For Sand soil the results were less satisfactory. In the first measurement (4.2% gVWC

±0.46) 10a rods’ results deviated for 6.6% VWC, 10b deviated for 6.3% VWC.

Standard deviations were low for all the rods with exception for 10b with standard

deviation of ±0.47. In the second measurement (9.2% gVWC ±0.7) all rods highly

overestimated the VWC, 10a for 4.5% VWC and 10b for 4.6% VWC. The rods

overestimated the VWC in the third measurement (16.4% gVWC ±1.26) as well, 10a

giving the highes estimated and deviated for 5.2% VWC (Table 3).

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

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