Units For Soil Water And Matrix Potentials - UMS HYPROP Operation Manual

Add the dry mass of the WP4 samples to
the dry mass of the remaining sample and
enter this total mass in HYPROP-FIT in the
register "Evaluation".
Enter the WP4 value of pF, gross wet mass
(wet soil + cup), gross dry mass (dry soil
+ cup) and tare mass (cup only) in the
register "Evaluation" and the table "Add
WP4 data points". This can be done by
cut and paste from a spreadsheet.

Units for soil water and matrix potentials

FC field capacity
Standard measuring range
of tensiometers
Permanent wilting point
Air dry,
depending on air humidity
Oven-dry
pF hPa
1 -10
1.8 -62
2 -100
2.9 ca. 850
3 -1,000
4 -10,000
4.2 -15,000
5 -100,000
6 -1,000,000
7 -10,000,000 -1,000,000 -1,000 -10,000 -1450.38 0.0618
Note: 0.981 kPa corresponds to 10 cm water column
92 | Addendum
The gravimetric water contents are
calculated automatically, converted into
volumetric water contents, and added
to the graphics. When fitting the hydraulic
properties these data have the same
weighing factor as the HYPROP data.
Power user may change this factor.
kPa=J/kg MPa bar
-1 -0.001 -0.01
-6.2 -0.006 -0.06
-10 -0.01 -0.1
-85 -0,085 -0.85
-100 -0.1 -1
-1,000 -1.0 -10
-1,500 -1.5 -15
-10,000 -10 -100
-100,000 -100 -1,000
psi %rF
-0.15 99.9993
-0.89 99.998
-1.45 99.9926
-12.3
-14.5 99.9261
-145.0 99.2638
-219.5 98.8977
-1450.4 92.8772
-1450.4 47.7632