Campbell-scientific Sentek TriSCAN® Manual v 1.2a Manual de usuario descargar pdf (Pagina 43)

TriSCAN Manual Version 1.2a

For very sandy soils, the %CLAY can be assumed to be close to zero (0).

Note: If the samples are tested in separate batches for ease of handling, then a couple of quality control

(QC) samples, should be added to each batch. These samples are then used to make a correction for inter-

assay variation.

Adjusting the Salinity scale from Volumetric Ion Content (VIC)

units to EC or EC

units

To determine the relationship between VIC and EC, plot the average VIC output recorded by the TriSCAN in

the field (over 10 minutes) against the measured EC or EC

in a spreadsheet based software program.

Perform a linear regression to derive the equation that best describes the relationship between VIC and EC

or EC

This equation can then be applied to the data recorded by the TriSCAN sensors in the field to convert VIC to

EC or EC

using either a programming change in the data logger, or using a spreadsheet program. An

example of this is shown in Figure 8. In this example, four treatments were used to collect the data.

In this example only the following relationship applies:

ECe = 1,095.5 x VIC – 50,157

This relationship will be different for each soil.

Figure 8: Field Correlation: Volumetric Ion Content vs. ECe

It is up to the operator’s discretion to apply the most accurate mathematical relationship to the field data.

y = 2E-05x + 0.0191

= 0.8376

0.05

0.1

0.15

0.2

0.25

0 2000 4000 6000 8000 10000 12000

Volumetric Ion Content

EC 1:5 (dS/m)

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 60 61

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Campbell-scientific Sentek TriSCAN® Manual v 1.2a Manual de usuario Pagina 43