not my own works
METHOD
The most reliable way of measuring the nutrients present
in the potting mix is to use the 1:1.5 extraction method,
which can be used to determine the EC and pH in the
root environment. The EC and the pH of the drainage
water will normally vary because the potting mix is
capable of holding back a number of elements or even
refusing them. It is best to carry out a 1:1.5 analysis after
three to five weeks. The easiest way to make this analysis
is to follow the plan given below step by step:
1. Take a potting mix sample. This can be done with a
ground drill or a spoon. Take the potting mix from
a large number of different places to ensure that
the sample is representative.
2. Put the sample in a bowl and determine if it
is moist enough. This is done by squeezing
some potting mix in your hand; if
moisture comes out it is OK. To
increase the samples moisture content
add distilled water.
(i used bottled water) Mix the potting mix
well after adding water.
3. Take a 250 ml measuring jug and fill it with
150 ml of distilled water. Add potting mix to
bring the volume up to 250 ml, mix it well
and leave it for at least 2 hours.
4. Mix it well once again and measure the pH.
5. Filter the mixture that you now have and
measure the EC. Target values for the EC are
between 1.1 and 1.3 and for the pH between 5.8
and 6.2.
taken from canna talk 6
http://cannatalk.com/index.php?page=download
seems as ur using canna soil
hope that helps bro?