How to Use a Hay Moisture Probe to Prevent Spoilage
Why Hay Moisture Matters
Baling hay at the right moisture level is one of the most important steps in preserving quality and reducing storage losses. If hay is baled too wet, microbial activity can cause:
- Mold growth
- Heating and nutrient loss
- Spontaneous combustion
If it’s too dry, leaf shatter increases and protein content may decline. That’s where a hay moisture probe comes in—giving you fast, accurate moisture readings before and during baling.
What is a Hay Moisture Probe?
A hay moisture probe is a handheld device designed to measure internal moisture in baled or windrowed hay. Probes are usually:
- Pin-style or probe-style, inserted into the bale
- Calibrated to read 8% to 40% moisture
- Powered by batteries and include a digital display
Common probe lengths range from 10 to 20 inches, allowing penetration into round or square bales for an internal reading.
When to Use a Hay Moisture Probe
Moisture content can vary widely across a field or even within the same bale. To ensure consistency:
- In windrows: Test before baling to make sure the hay is dry enough.
- In bales: Test multiple locations per bale, especially the center.
- During baling: Continue to spot-check throughout the day, especially with changing weather.
Ideal baling moisture:
- Small square bales: 18–22%
- Large round/square bales: 15–18%
How to Use a Hay Moisture Probe Properly
Here’s a step-by-step guide for accurate results:
1. Power On & Calibrate
Make sure your unit has fresh batteries. Some models require a quick calibration check before first use.
2. Select a Representative Sample
Test multiple bales or windrows from different field sections. Hay moisture can vary greatly based on shade, cutting time, or crop type.
3. Insert the Probe Correctly
- Insert the probe deeply into the bale, ideally into the center
- Hold steady for several seconds
- Avoid shallow readings or probing wet exterior spots only
4. Read and Record the Results
- Take 3–5 readings per bale and calculate the average
- If readings vary more than 5%, repeat in a new location
5. Clean and Store the Probe
After use, wipe down the probe to remove hay particles or sap, and store in a dry area.
Choosing the Right Hay Moisture Probe
At Prairie Ag Products, we offer trusted hay moisture meters designed for reliability and field durability. Look for features like:
- Rugged construction
- Replaceable batteries
- Digital readout in seconds
- Compatibility with baled or loose hay
Recommended Tools:
- AgraTronix 07140 Hay Moisture Tester with probe
- Delmhorst FX-2000 with 830 Series probes
The Cost of Getting it Wrong
Ignoring hay moisture can cost farmers:
- Thousands in spoiled bales
- Lost protein and feed value
- Fire risks in storage barns
With hay prices rising and forage value more critical than ever, a $200–$400 moisture tester pays for itself quickly.
Final Thoughts
Using a hay moisture probe is one of the easiest ways to reduce forage spoilage, improve bale safety, and protect your investment. Whether you’re a livestock producer or custom baler, moisture monitoring should be part of your harvest routine.
Need help picking the right tester? Contact our team for expert guidance.
