The report said the Council has also made tremendous achievement by designing, fabricating and manufacturing such instrument indigenously like tensiometer, gypsum block
, water level indicator, sprinkler heads, rainguns, and salinity sensor which are being provided to various research and development organizations in the country, at a low cost.
In order to calibrate the resistance probe inside the gypsum block, the water content from several samples was determined by a gravimetric method, which is widely used to calibrate indirect water content measurements [26, 27].
During these tests, data from electrical resistance probes, a gypsum block, and a drop counter were recorded using different experimental setups.
Figure 2 shows the water saturation, defined as the water content divided by porosity, versus electrical resistivity for the gypsum block sensor installed in the ATC.
The electrical resistance probes without a gypsum block were also used to detect drainage processes in the automated test column (ATC).
I had been using moisture monitoring devices (gypsum block
) to show them that the corn was not using enough moisture to necessitate irrigating before the first week in July.
: Gypsum blocks
are the simplest--but unfortunately not the most reliable--means of measuring soil moisture.
These standards apply to thermal insulation products (10 standards - Official Journal of December 15, 2001), geotextiles (9 standards - OJ of June 26, 2001), fixed fire-fighting installation (10 standards -OJ of July 18, 2001, December 15 2001 and February 14, 2002) and gypsum blocks
(standard EN 12859:2001 - OJ of December 15, 2001).
Gypsum blocks will tell you New technology has made an old tool for measuring soil moisture--the gypsum-block moisture sensor--more reliable than it used to be.
Gypsum blocks, which have been around for about 60 years, are simply marshmallow-like plaster of Paris cylinders that contain two electrodes.
As with other moisture sensors, it's best to put gypsum blocks in several different microclimates or soil types around your yard.
Although most gypsum blocks gradually break down and read zero after several years, they are inexpensive to replace.