User Manual
23
bulk
g
v
The average water content for the replicates and the recorded CS616 period
are one datum pair to be used for the calibration curve fit.
8.2.5
Calculations
The empty cylinders used for core sampling should be clean; both empty
weight and volume are measured and recorded. For a cylinder, the volume
is:
h
d
volume
2
2
where d is the inside diameter of the cylinder and h is the height of the
cylinder.
During soil sampling it is important that the cores be completely filled with
soil but not extend beyond the ends of the cylinder.
Once soil core samples are obtained, place the soil-filled cylinder in a
small tray of known empty weight. This tray will hold the core sample
during drying in an oven.
To obtain m
wet
, subtract the cylinder empty weight and the container empty
weight from the weight of the soil filled cylinder in the tray. Remove all
the soil from the cylinder and place this soil in the tray. Dry the samples
using oven or microwave methods as described above.
To obtain m
dry
, weigh the tray containing the soil after drying. Subtract
tray weight for m
dry
. Calculate gravimetric water content,
g
, using
g
wet
dry
dry
m
m
m
.
To obtain soil bulk density, use
bulk
dry
cylinder
m
volume
Volumetric water content is calculated using
bulk
g
v
.
9.
Maintenance
The CS616/CS625 does not require periodic maintenance.
10.
References
Rhoades, J.D., P.A.C. Raats, and R.J. Prather. 1976. Effects of liquid-phase
electrical conductivity, water content and surface conductivity on bulk soil
electrical conductivity. Soil Sci. Soc. Am. J., 40: 651-653.