User Guide

5
4) Wash the electrode with tap water (not distilled)
5) Insert the electrode pushing it slightly into the soil to ensure proper contact
6) Observe the measurement
7) Wash the electrode with tap water (not distilled) and (using a finger) gently
remove any soil remaining on the electrode (avoid using a rag or cloth)
8) Repeat the procedure in different locations in the field
9) Consider the average of the measured data
For best result, it is advisable to measure the pH of a soil solution, using a
sample of soil and soil preparation solution HI 7051; it is better to use this
procedure if you have to test a stony field in which you risk damaging the
electrode.
Procedure for the measurement of soil solution (1:2,5)
A) Sampling
1) Extracting Soil Sample
Take 1 sample per 1000 m
2
(0.25 acre) of homogeneous area
Even for small areas, 2 samples are recommended (the more the samples,
the better the end-results, because the result is more representative)
2) Avoid extracting samples from soil presenting obvious anomalies and consider
them separately
3) Sample quantity:
Take the same quantity of soil for each sample. For example, use bags with
similar dimensions (1 bag per sample)
4) Depth of extraction:
General: dig and discard 5 cm (2") of topsoil
Herbaceous crops: from 20 to 40 cm of depth (8" to 16")
Orchards: from 20 to 60 cm of depth (8" to 24'’)
5) Spread the soil samples on the pages of a newspaper and let the soil dry in
a shady place or put it in an oven at 40° C
6) Crumble the dried soil and mix all the samples together to obtain a
homogeneous mixture, discarding stones and vegetable residues
7) From this mixture, take the soil sample for analysis
B) Soil solution preparation and measurement
1) Sift the soil at 2 mm
2) Weigh 10 gr of soil and put it in 25 ml of soil preparation solution HI 7051
(utilize the apposite beaker) or 20 gr of soil per 50 ml of soil preparation
solution HI 7051
3) Mix for 30 seconds
4) Wait 5 minutes
5) Mix again and measure the pH of the solution