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Rob Vassar
10/27/05 21:27
  10/27/05 21:28

Read: 810 times
Round Rock, Tx

#103064 - Gypsum block sensor
Responding to: Bruce Revor's previous message

I studied hydrogeology in college. We used a resistive gypsum block moisture sensor to measure soil moisture. The idea being that a direct measurement needs to be calibrated for the soil type, but the soil and a known/calibrated unit of material, in this case a gypsum block, will be in equilibrium with the soil.

There's a company somehwere here in Austin that completely automates your sprinklers using a combination of local sensors, and local rainfall estimates polled off the Internet. I don't have much information on them, but I have read that it's popular with commercial landscaping here. From what I understand, to get a proper solution, you need tempurature history, a local estimate of rainfall, an estimate of evapotranspiration, as well as soil moisture. Further improvements can be had by sampling a pyranometer to measure total solar input...

Anyhow... I've been out of college too long to have any sources of the sensors I used. Here's a couple quick soil moisture sensor links I found:


List of 16 messages in thread
soil dampness      Erik Malund      10/26/05 11:27      
   Conductivity?      Sasha Jevtic      10/26/05 11:58      
      Conductivity      Andy Neil      10/26/05 14:28      
   addendum      Erik Malund      10/26/05 12:34      
      Nutsy idea?      Craig Steiner      10/26/05 14:07      
      Configuration/calibration      Sasha Jevtic      10/26/05 14:40      
         that would not be calibration      Erik Malund      10/26/05 15:01      
            humidity      Terry Lingle      10/26/05 22:42      
      Water for a short while and compare      Bert Van Den Berg      10/27/05 02:36      
   Another idea      Bert Van Den Berg      10/27/05 13:17      
   Spatially Distributed Soil Measurements      Bruce Bailey      10/27/05 13:51      
      I needed that      Erik Malund      10/27/05 14:32      
         There is Yet Hope      Bruce Bailey      10/27/05 17:20      
   soil dampness      Bruce Revor      10/27/05 17:07      
      Gypsum block sensor      Rob Vassar      10/27/05 21:27      
   Capacitance.      Steve M. Taylor      10/28/05 12:36      

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