Protocol: Soil Moisture - Gypsum block depth sampling
The four optional tasks in this supplement have been designed
for advanced students who want to install, calibrate and measure
soil moisture and temperature sensors at the standard depths. The
advantages of more frequent observations and the non-destructive
nature of these observations must be balanced by the extensive
effort required to calibrate the gypsum blocks. This protocol is
used to estimate a soil moisture depth profile and is extremely
valuable in conjunction with soil vegetation and crop
investigations found elsewhere in this manual.
Complete Protocol from NOAA
http://www.hwr.arizona.edu/soilpc0.html
v. Jun 2, 1996