Delta-T HH2, User Manual

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Profile Probes Moisture Meter User Manual 4.0
Soil Set-Up (sub-menu)
Displays available soil parameters that may be defined.
a0 & a1
These options are available for user-defined soils only, not Mineral or Organic
Options: a0 Range: -49.9 to +50.0 Default: 1.0
a1 Range: 0.1 to 50.0 Default: 7.0
Previously you should have selected a custom soil name from the
Options , Soil Set-
Up menu.
Select a0 . Choose an a0 value by scrolling through the range and press Set .
Select
a1
and repeat the last step.
Field Capacity
Sets the Field Capacity, used for mm Deficit calculations.
Options: 0 to 1 Default: 0.38 Units: m
3
.m
-3
If you want mm Deficit you must define the Field Capacity (and Root Depth in the
Options, Data menu).
See the table for Mineral soils on page 106.
Organic soils are so variable you have to determine field capacity experimentally,
before it makes any sense to take mm Deficit readings.
See "Calculating Field Capacity" on page 108.
Select
Options, Soil Set-Up and choose a soil.
Select Capacity .
Scroll to select the actual field capacity.
Press Set to select it.
Note : A negative "mm Deficit" result indicates that you set the Field Capacity too low.