2017-05-30
Manual TRIME_PICO64-32 Version 2_0
Page 39
12.2
EC
TRIME
Measurement Range for TRIME Probes
All PICO probes work with a concurrently basic calibration for moisture and conductivity. This allows
a check of the limits of saline soils according to standards of FAO2006 for specific soils.
Measurement Range Conductivity for PICO64, PICO32, T3-IPH, PICO-PROFILE
0…10dS/m EC
TRIME
(here is, depending on moisture content EC
w
>20dS/m)
All TRIME probes have a linear EC
TRIME
calibration curve with two calibration points. This ensures an
equal behaviour of a TRIME probe type (e.g. PICO32).
Calibration Point1: Dry glass beads = 0dS/m EC
TRIME
Calibration Point2: Saturated glass beads with water EC
w
5dS/m = 5dS/m EC
TRIME
With dry glass beads (not air!) it is ensured that the conductivity range of dry soils starts with nearly
0dS/m. The calibration at point2 was performed with glass beads and water which was adjusted with
salt to a pore water conductivity of EC
w
= 5dS/m at a temperature of 23°C.
12.3
Measurement of Pore-Water-Conductivity or Salt-Content of Soils
The possible salt stress depends on soil type and plant species and can be roughly classified:
Slight salinization:
1-3g of salt per liter
Average salinity:
3-5g salt / liter
Strong salinity:
5-10g salt / liter
Very high salinity:
> 10 g salt / liter
The conversion of the salt content in grams of salt per liter water (TDS Total-Dissolved-Salts) into the
pore water conductivity of EC
w
happens with:
Salt content in grams of salt per liter of water TDS = 0.64 * EC
w
An EC
w
= 5mS/cm result thus with 3.2 grams of salt per liter (pore) water
EC
w
can be determined with a laboratory conductivity meter. 1dS/m = 1mS/cm
A determination of the pore water conductivity or salinity of soils and sand at different moisture
values is possible by using a Moisture/ EC
TRIME
diagram for the PICO32 or PICO64. With measuring
moisture and EC
TRIME
, the pore water conductivity (or TDS salt content in grams salt per liter) of the
soil can be determined by using the individual pore water water curves.
The below displayed Moisture/ EC
TRIME
charts were created for sand and a loamy soil.
We recommend the creation of a separate Moisture/ EC
TRIME
diagram for the intended soil in the
designated ranges of salinity.
Summary of Contents for TRIME-PICO 32
Page 1: ...Manual TRIME PICO 64 32...
Page 9: ...2017 05 30 Manual TRIME_PICO64 32 Version 2_0 Page 9 3 TRIME PICO64 32 Versions...
Page 33: ...2017 05 30 Manual TRIME_PICO64 32 Version 2_0 Page 33...
Page 34: ...Manual TRIME_PICO64 32 Version 2_0 2017 05 30 Page 34...
Page 47: ...2017 05 30 Manual TRIME_PICO64 32 Version 2_0 Page 47 Notes...
