SOWACS Fwd: gypsum block sensor

[Pretty mugwaze]

Pretty mugwaze writes to the sowacs list:
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 I am doing a project on an automated irrigation
control system I have made two gypsum blocks with
electrodes which are 1.2cm and 0.6cm apart. The 1.2cm unit
is not changing much in voltage - it reads the same
value for almost two days, but the other one is
changing from 0.1v to about 0.3v. I have put the
block in series with a resistor so that a potential divider
can be used.
What do you think could be the problem with the other block (1.2cm)

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