which are used to construct these soil-moisture blocks
- Gypsum blocks are most useful at water potentials ranging
from 100 KPa to 1.5 MPa, while in wetter soils these units
tend to disintegrate too quickly.
- Nylon units consist of stainless steel electrodes separated
and wrapped with three pieces of nylon fabric and they are
assembled in perforated stainless steel casings. They are
sensitive at higher soil-water contents than the gypsum
units (approx. 10 KPa ) but require special care when
installing, in order to assure correct soil-probe contact.
- In fiberglass blocks, the electrodes are separated by
fiberglass cloth but otherwise they are similiar in design
and characteristics to the nylon units.
- To reduce the shortcomings of the above resistance blocks,
(low sensitivity at high water contents, bad contact with
Share with your friends: |
