Campbell CS616 Instrukcja Obsługi Pobierz pdf (Strona 6)

Table of Contents

7.4 Operating Range ................................................................................ 29

7.4.1 Soil Electrical Conductivity ....................................................... 29

7.4.2 Soil Organic Matter, Clay Content and Soil Bulk Density ......... 29

7.5 Error Sources in Water Content Reflectometer Measurement .......... 30

7.5.1 Probe-to-Probe Variability Error ................................................ 30

7.5.2 Insertion Error ............................................................................ 30

7.5.3 Signal Attenuation Error ............................................................ 30

7.6 Temperature Dependence and Correction ......................................... 31

8. Water Content Reflectometer User-Calibration ...... 32

8.1 Signal Attenuation in Conductive Soils and Need for Site-Specific

Calibration ..................................................................................... 32

8.2 The User-Derived Calibration Equation ............................................ 33

8.3 Collecting Laboratory Data for Calibration ....................................... 34

8.4 Collecting Field Data for Calibration ................................................ 36

8.5 Calculations ....................................................................................... 38

9. Maintenance .............................................................. 39

10. References ................................................................. 39

Appendix

Discussion of Soil Water Content ......................... A-1

Figures

6-1. CS616 Water Content Reflectometer .................................................. 5

6-2. CS625 Water Content Reflectometer .................................................. 5

7-1. CS616 and CS625 linear and quadratic calibrations derived from

loam soil ......................................................................................... 25

7-2. CS616 and CS625 response for low EC loam with bulk density

1.4 g cm

-3

, a low EC sandy clay loam with bulk density 1.6 g

-3

, and a high EC sandy clay loam with bulk density 1.6 g

-3

. ............................................................................................... 26

7-3. Difference in % volumetric water content between linear and

quadratic forms of calibrations ...................................................... 28

7-4. Percent volumetric water content error corrected for by

temperature correction equation ..................................................... 32

Tables

6-1. CS616/625 wiring code. ......................................................................... 5

6-2. CS625 Sample Programs ...................................................................... 11

6-3. CS616 Sample Edlog Programs ............................................................ 16

7-1. Standard calibration coefficients for linear and quadratic forms. ......... 27

7-2. Calibration coefficients for sandy clay loam with bulk density 1.6 g

-3

and electrical conductivity at saturation 0.4 dS m

-1

for both

linear and quadratic forms. ............................................................ 28

7-3. Calibration coefficients for sandy clay loam with bulk density 1.6 g

-3

and electrical conductivity at saturation 0.75 dS m

-1

for

both linear and quadratic forms. .................................................... 28

1 2 3 4 5 6 7 8 9 10 11 ... 49 50

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