can be seen from the graphs above, the pattern of changing
moisture content with depth displayed minimal consistency
between probes. All soils showed oscillating moisture content
at each particular depth throughout the week. We can see
here that the range
of observed water contents was quite broad across all three
probes, though the range of observed water contents at each
probe generally did not overlap. The only exception was
the overlap of the 60 cm values at the cultivated area "A"
probe with those at 60 cm depth at the cultivated area "B"
probes A and B (cultivated area), the soil
tended to be wetter in the morning than in the afternoon,
and soil water content tended to increase throughout the
week. The soil at probe B was wetter than at probe A. At
probe B, the soil was more wet towards the surface, and
became dryer at depth. The variation in water content over
time was much greater at probe A than at probe B.
the pasture, the trends were opposite:
the soil generally becomes dryer with time, and the soil
tends to be wetter in the afternoon than in the morning.
The soil surface is dryer than the soil at depth; however,
once the soil reaches its maximum water content at about
30 cm, it tends to become dryer with increasing depth. The
pasture soil is dryer than the soil in the cultivated area.
effects of this measurement technique on the agroecosystem
are minimal and localised. A bore has to be dug for the
probe access tube, but there is no further disruption of
the environment once the device is installed.
calibration in the field for the most precise results
knowledge of soil, crop and management at the site required
for the optimal set-up of each probe
about shrink-swell soils creating air gaps next to the
access tube, which gives adverse readings. Air-gaps around
the access tube need to be eliminated for the most accurate
C-Probe Soil Moisture Probe
Ronald T.; Pangburn, Timothy; Bates, Roy E.; Brockett, Bruce
E., 1998. Soil
Moisture Determinations Using Capacitance Probe Methodology.
COLD REGIONS RESEARCH AND ENGINEERING LAB, HANOVER
R., 2004. Capacitance