Measurement Engineering Australia

Sowacs Promotion Webpage

Measurement Engineering Australia (MEA) is an established engineering firm based in Adelaide (South Australia) and founded in 1985. Known in the viticultural industry for their Automatic Weather Stations, MEA's engineering team began work in 1995 to provide a means of automatically logging gypsum blocks, to provide continuous soil moisture measurement.
This is the story of that development process
and its outcomes.


Measurement Engineering Australia Data Logging Application and Measurement Systems Engineers

41 Vine St,
MAGILL,
SA 5072,
Australia
ph 61 8 8332 9044,
fax 61 8 8332 9577
e-mail: sales@mea.com.au

 

Resurrecting the Gypsum Block for Soil Moisture Measurement

The gypsum block has been around since the 1940's, making it one of the oldest methods of soil moisture measurements. At about A$20 per block, it is also one of the cheapest methods of soil moisture measurement. And because the gypsum block can be read manually by the grower with a hand-held reader (about A$700), the cost per measurement point remains the lowest in the industry.

Yet use of the gypsum block in vineyards fell out of favour for many years, as other high-tech soil moisture sensors (eg. neutron probes, capacitive probes, time-domain reflectometers) made their appearance.
Gypsum blocks aren't perfect, but they are practical and reliable. One of their failings is that they (like the neutron probe) have traditionally been a manually read device, limiting the number of readings available to one or two per site per week. Measurement Engineering Australia (MEA) is an established engineering firm based in Adelaide (South Australia) and founded in 1985. Known in the viticultural industry for their Automatic Weather Stations, MEA's engineering team began work in 1995 to provide a means of automatically logging gypsum blocks, to provide continuous soil moisture measurement.

This is the story of that development process and its outcomes.

Click a link to read further..


Suction vs water content
Soil Water Estimation by Electrical Conductivity Methods
The Gypsum Block
Installation of Gypsum Blocks
Some golden rules for installation.
  MEA2175 Gypsum Block Field Station
Gypsum Block Calibration
Field Trials
Future Developments
Contributors to this Article

© Bruce Metelerkamp
www.sowacs.com/feature/mea/mea.html
last update : 23 Feb 2003