How to Test Hay Moisture Levels to Prepare for Safe Storage

Posted by PAUL LAURENZI on Apr 17, 2015 2:06:00 PM

Failure to properly store your hay can lead to horrible consequences including the potential of dangerous fire hazards. And with the danger of your hay products at stake comes the downfall of your revenues as a result. This is why testing your moisture levels before and after storage is crucial. Baling hay at proper moisture levels and storing it in a way that reduces mold development preserves leaves, color and even the feed value.

The problem with moist hay is that it becomes a breeding ground for fungus to grow. And with a wetter texture, hay’s temperature gets higher with microorganisms gathering in and around it. When the temperature rises, protein begins to degrade and the hay may become indigestible. When temperatures reach around 180°, there’s a significant risk of spontaneous combustion.

moisture meter hay windrow

Unfortunately, moisture levels can be difficult to judge as hay may look and feel dryer than it actually is on paper. On the other hand, a moisture tester specifically designed for testing hay in the bale or the windrow (a row of hay raked up to dry before being baled or stored) can help you obtain accurate moisture readings to protect your valuable hay crop.

What Is the Right Hay Moisture Level?

Moisture should be measured in terms of ranges — not specific points. Generally, round bales require a slightly lower moisture level than square bales. The challenge in either shape is the variability of both the electrical properties of the hay and its non-uniformity. This makes it more difficult to come up with an accurate representation of moisture.

Traditionally, the recommended moisture content for baling hay without a preservative is between 18-20%.

If your crop requires that you utilize a preservative, it’s important that you use the guidelines explained by the preservative’s manufacturer. For hay to be baled at a higher than recommended moisture level, the use of a specified moisture meter, drying agents and preservatives should help you. Regardless of which you choose, we advise that you don’t attempt to bale hay before it reaches an appropriate moisture level.

How Do I Use a Moisture Tester for Hay in the Windrow?

To get a proper reading of its moisture, the hay should be placed in a 5-10 gallon bucket. The higher the density, the easier it is for testers with multi-pin prods to get an accurate reading. So be sure to pack down the hay as tightly as possible before you begin to measure.

Like with baled hay, numerous tests are required to obtain a quality reading. After taking the first reading, the operator should mix the hay, repack it and test again several times, then average the readings.

An additional test involves choosing several large, slow-drying stems from the same area of the windrow and lying them one at a time across two adjacent points on a multi-prong electrode. (Note: These readings will typically be a few points higher than the actual moisture level.)

Pay attention to the areas where the hay is the most dense and repeat these steps in different parts of the field. Your decision to start baling should take into consideration the variation found among windrow readings and the average stem moisture.

How Do I Use a Moisture Tester for Hay in Bales?

Good question! After hay has been baled, the internal density and stem-to-leaf ratio are generally inconsistent throughout the bale. Because of this, it’s necessary to test a bale in several locations and average the readings — taking specific note of the high readings. We also recommend testing the bales in different locations as field conditions could affect the moisture levels.

moisture meter hay stacks

A firm, uniform contact will yield more accurate results, so the prod should be driven across bale slices.

NOTE: Random spoilage of baled hay can occur due to fluctuating field conditions (i.e. windrow size, soil moisture, density, low spots and shade). Therefore, it’s also important to check bales at several locations in the field.

On-the-Go Moisture Testing in the Bale Chamber

The hay producer can install a micro-controller-based moisture meter in the tractor cab and connect it to a sensor in the bale chamber to produce on-the-go moisture monitoring — without leaving the cab. The microcomputer collects and processes 8 separate readings that update every 4 seconds. The meter then displays the average and highest reading.

The FX-2000 is a reliable moisture reading tool for on-the-go monitoring. If you’re seeking HOW to do this, using a microprocessor-based continuous monitor is another easy and reliable method.

Take These Temperature Precautions Seriously

The more variations you measure in your hay, the more tests should continue to take to ensure a proper measurement.

Keeping your hay baled at less than 20% moisture is one of the key steps to maintaing a safe storage. Please also consider the inconsistencies that may occur due to the humidity in the air. Ensuring that hay is not baled at moisture levels above 20% is a significant step toward safe storage. A high-risk period is anywhere from 2-6 weeks after storage is complete — so be sure to take extra precaution during this time period.

Stable hay hovers around 125°, but when you notice internal temperatures rising to 150°, be sure to have your moisture meter ready!

For more personalized service to address your questions and concerns, please contact our service representatives today!

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Topics: hay