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For more on units of measurement:
Sensoterra Index scale (SI)
Sensoterra Index scale is based on pF data and focuses on
the ‘Too Dry’, ‘Too Wet’, and the ‘Plant available water”
(or Healthy) zones and spreads the three zones over a 0 to
10 scale. The 0 and 10 values represent oven-dry soil and
complete saturation of the soil, respectively. The Sensoterra
Index is a simplified soil moisture score that allows you to
determine soil health at a glance, as well as making it easy
comparing data from sensors in different soils.
Complete saturation (pF0)
Field capacity (pF2)
The maximum amount of
water the soil can hold
Permanent wilting
point ±2 (pF4.2)
Wilting point (pF2.5–pF3)
The point at which plants
begin to wilt permanently
through drought
Oven dry soil (pF7)
pF7
0
1
2
3
3.3
6.6
4
5
6
7
8
9
10
pF4
Limiting
Healthy
Too Wet
Too Dry
Productive
pF2.5
pF2
pF0
Sensoterr
a Inde
x
pF
V
al
ues
14 | Multi-Depth soil moisture sensor
14 | Multi-Depth soil moisture sensor
