Trying to make hay: Tips to success


Tony Nye - OSU Extension



More planting progress was completed this week. Again we are more fortunate than some of our farming neighbors in other parts of Ohio. My home area of northwest Ohio just can’t seem to catch a break.

Besides trying to get crops planted, now is the time we should be getting hay cut. Wet, soggy fields, and not many good drying days, have prevented many from making hay this year.

Ohio State University forage specialist Mark Sulc recently adapted an article with permission that was published in Farm and Dairy on June 2, 2010. Here are some of the major highlights producers need to be aware of with the current conditions when making hay.

First and foremost, Sulc encourages everyone to be patient in waiting for soils to firm up before attempting to make our first cutting of hay, because harvesting on soft soils does long-term damage to future productivity.

Once the soils are firm enough, there are several proven techniques that can speed up the hay drying process to take the most advantage possible with any sunny days we do get.

Haylage vs. hay. Consider making haylage/silage or balage instead of dry hay. Since haylage is preserved at higher moisture contents, it is a lot easier to get it to a proper dry matter content for safe preservation. Proper dry matter content for chopping haylage can often be achieved within 24 hours or less as compared with 3 to 5 days for dry hay.

Proper dry matter content for silage ranges from 30 to 50% (50 to 70% moisture) depending on the structure used. Wrapped balage should be dried to 40 to 55% dry matter (45 to 60% moisture). Compare that to dry hay that should be baled at 80 to 85% dry matter (15 to 20% moisture), depending on the size of the bale package. The larger and denser the dry hay package, the dryer it has to be to avoid spoilage.

Mechanically condition the forage. Faster drying of cut forage begins with using a well-adjusted mower-conditioner to cause crimping/cracking of the stem (roller conditioners) or abrasion to the stems (impeller conditioners). At least 90% of the stems should be cracked or crimped with roller conditioners or should show some mechanical abrasion when using impeller conditioners.

Maximize exposure to sunlight. Exposure to the sun is the single most important weather factor to speed drying. The swath width should be about 70% of the actual cut area.

Tedders are a way to spread out and aerate the crop for faster drying. Tedders are especially effective with grass crops but can cause excessive leaf loss in legumes if done when the leaves are dry.

Tedders can be a good option when the ground is damp (as this year), because the crop can be mowed into narrow windrows to allow more ground exposure to sunlight for a short time, and then once the soil has dried some the crop can be spread out with the tedder.

When making haylage, if drying conditions are good, rake multiple wide swaths into a windrow just before chopping. For hay, if drying conditions are good, merge or rake multiple wide swaths into a windrow the next morning when the forage is 40 to 60% moisture to avoid excessive leaf loss.

Sulc notes that research studies and experience have proven that drying forage in wide swaths can significantly speed up drying. Faster drying in wide swaths results in less chance of rain damage and studies by the University of Wisconsin showed that wide swaths (72% of the cut width) result in lower NDF and higher energy in the stored forage.

Consider desiccants. Desiccants are chemicals applied when mowing the crop that increase the drying rate. The most effective desiccants contain potassium carbonate or sodium carbonate. They are more effective on legumes than grasses.

Desiccants work best under good drying conditions, but don’t help much when conditions are humid, damp, and cloudy.

Consider a preservative. Sometimes the rain just comes quicker than we have time for making dry hay. As Sulc mentioned above, making haylage helps significantly with this.

A second option is to use a preservative. The most effective preservatives are based on propionic acid, which is caustic to equipment, but many buffered propionic preservatives are available that minimize that problem.

Preservatives inhibit mold growth and allow safe baling at moisture contents a little higher than the normal range for dry hay.

A final word to the wise from Sulc is: Watch wet bales carefully!

If hay is baled at higher moisture contents that are pushing past the safe limits, keep a close watch on them for two to three weeks. Use a hay temperature probe and monitor the internal temperature of the hay during the first three weeks after baling.

Every year someone’s barn burns down because of spontaneous combustion of wet hay. So if hay is on the wetter side, keep it outside or in a well-ventilated area. Don’t stack wet hay, because that prevents the heat and moisture left in the hay from escaping.

It is normal for hay to go through a “sweat” in the few days after baling. Internal temperatures of 110 F in the first five days after baling are quite common in our region and are not a big concern.

Hay bale temperatures of 120 to 130 F will likely result in mold growth and will make the protein in the hay less available to animals. While those temperatures are not high enough to cause hay fires, the concern is if the mold growth continues and pushes temperatures upward into the danger zone.

If the temperature in the hay continues to rise, reaching 160 to 170 F, then there is cause for alarm. At those elevated temperatures, other chemical reactions begin to occur that elevate the temperature much higher, resulting in spontaneous combustion of the hay in a relatively short period of time.

Hay fires can be avoided by careful attention to the management practices outlined above along with cooperation from the sun. Let’s hope for plenty of sunshine soon!

Tony Nye is the state coordinator for the Ohio State University Extension Small Farm Program and has been an OSU Extension Educator for agriculture and natural resources for over 30 years, currently serving Clinton County and the Miami Valley EERA.

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Tony Nye

OSU Extension