Rev 1 - October 2023
existing between electrical conductivity and moisture content in hay. As
moisture content increases, so does the conductivity. Tests on hay at high
moisture content, over 25%, are less accurate. This is mostly due to the
variability in moisture distribution. The reduced level of accuracy in the
high range does not significantly affect the usefulness of the meter, as a
few high readings indicate that some action be taken to dry the hay to
avoid spoilage or even self-combustion. While it is important to note the
average of several readings, it is even more important to note the high
readings and the frequency at which they occur.
Moisture readings at all stages of production should be considered in
ranges, rather than as absolute indications due to the inherent
variability of material, and the moisture distribution.
Use the guidelines below and always consider prevailing environmental
conditions, regional practices and the influence of preservatives:
Small square bales – 18%-25%
Large square bales – 15%-18%
Round bales – 12%-16%
Curing
Before proper curing has taken place, wide variations in moisture content
should be expected in both recently baled hay and hay in the windrow.
These variations will be exposed by meter readings taken on different
parts of the windrow or bale. The higher the moisture range, the wider
the variations. The more curing has been allowed to take place, the
greater uniformity in moisture distribution can be expected. The validity
of the meter readings is closely related to the care spent in sampling the
hay to be tested. Whether testing hay in the windrow or bales, the
number of tests made should be increased whenever the initial readings
show considerable variations.
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