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Effectiveness of Gypsum and Tensiometers in top 6 inches.

I am after a little bit of information on the use of Gypsum blocks and
tensiometers within the top 6 inches of soil.

Would the response of the above be affected by the changes in the following
variables - temperature, conductivity and pH ? 
Alot happens close to the surface due to both environmental and cultural
management. The application of lime to change ph, the increase in
conductivity after fertigation (especially in trickle), changes in soil
temperature with the season or bare soil compared to mulch. 


If they do vary, Will it affect their accuracy in determining when and how
much to irrigate ? For instance, if previous to the change the point to
irrigate with 25 mm was at -40 kPa, what will it be now ? 
Can this variation, if any, be balanced using calibration curves ? Does it
require considerable effort ? 
Does all this mean nothing when used purely by a farmer schedule his irrigation?

Regards

Peter Broomhall


 
Peter Broomhall
Horticulural Consultant

Hortech Services Pty Ltd
a.c.n. 060 406 957
P.O. Box 370
Kallangur QLD 4503
Australia

P: +61 418 708 573
F: +61 7 3886 0389

hortech@ats.com.au