IMKO TRIME-PICO 32, Руководство пользователя

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Manual TRIME_PICO64-32 Version 2_0 2017-05-30
Page 42
12.4 Creation of a Moisture/ EC
TRIME
Diagram for a particular Soil
The following description shows a possible way to create a Moisture/ EC
TRIME
diagram for a particular
soil:
Take a soil sample and determine the salt content with a laboratory method. (e.g. determine EC
w
of
the soil/water saturation extract).
Dry the soil sample to 0% moisture. Cut it into small pieces and grind the soil so that it can be mois-
tened by hand as evenly as possible (eg with a water spray pump).
Moisten the soil evenly with a pore water solution for example 2.56g of salt per liter (equivalent to
EC
w
= 4dS/m) to the first measurement point (e.g 2.5% moisture). Take into account, that the soil
already contains salt. I.e. were already 1g of salt per liter in the soil, you put a curve for a pore water
conductivity record of 2.56 g + 1g salt = 3.56g per liter (EC
w
= 5.5 dS/m).
Compact the soil in a plastic bowl (no metal and not too small!) so that it largely corresponds to the
natural density. Concerning the insertion of the PICO-probe rods for measurement, it is recommend-
ed to perform several measurements per point in order to form an average value for each moisture
and EC
TRIME
value. It is important to ensure that the measuring field is not disturbed around the rods,
eg by previous punctures.
Moisten the soil more, as homogeneous as possible with the pore water solution EC
w
= 4dS/m to eg
5% moisture. Again compact the soil in a plastic bowl so that it largely corresponds to the natural
density. Concerning the insertion of the PICO-probe rods for measurement, it is recommended to
perform several measurements per point in order to form an average value for each moisture and
EC
TRIME
value. It is important to ensure that the measuring field is not disturbed around the rods, eg
by previous punctures.
Take more moisture and EC
TRIME
values, up to soil saturation.
Create the pore-water curve for example for 3.56g salt/liter (EC
w
=5.5dS/m) with the added moisture
and EC
TRIME
values.
Take up several curves for different pore water contents.
If the soil sample is already too heavily loaded with salt, a washing out of the ions would be possible,
but without the lost of the fine fraction. After a subsequent drying and crushing of the soil, the Mois-
ture/ EC
TRIME
diagram can be established with a lower salt content. It is also possible to use distilled
water for obtaining the lowest curve.
Note: The effort for a Moisture/ EC
TRIME
diagram is not negligible. IMKO has the hope to establish
with the EC
TRIME
process an easier, faster, better and generally accepted determination of the salt
contamination of soils. In future IMKO plans to provide or publish different Moisture/ EC
TRIME
curves
for standard soils. We expect to cover nearly most soils with about 4-5 diagrams.