Example 2 – Campbell Scientific Sentek TriSCAN® Manual v 1.2a User Manual

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TriSCAN Manual Version 1.2a

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Example 2

Multiple irrigation events are plotted with soil water content and salinity concentrations (VIC) against time in
Figure 11. The initial soil salinity level on October 31 before 12.00 pm was represented by a value of 832.2
VIC (0.1 dSm

-1

). A horizontal ruler is located slightly below this threshold at 775.18 VIC to provide a

reference baseline for salinity.

The first irrigation applied shortly after 12.00 pm on October 31 contained salts measuring 5.8 dSm

-1

and

resulted in a VIC level of 1865.41, indicated by a second horizontal ruler.

The second irrigation on November 1 was applied using distilled water to flush out soil salts. This irrigation
event caused a steep drop in the salinity, levelling out on November 2, at a soil salinity close to the initial
measurement.

The third irrigation, applied on November 2, at an EC of 1.0 dSm

-1

did not cause any change in VIC.

The fourth irrigation applied on November 3 at an EC of 2.2 dSm

-1

raised the VIC.

The fifth irrigation of 3.0 dSm

-1

applied on November 4 raised the VIC further.

Rainfall and another leaching irrigation event applied on November 5 caused the VIC to drop and level out
slightly above the reference baseline.

Figure 11. Soil Water and Salinity Graph