Quick answer: Alfalfa is the most unforgiving crop to round-bale because the leaves — where the protein is — shatter when it's dry, while the stems heat and mold when it's tough. The fix is moisture and timing: bale dry alfalfa around 16–18%, rake and bale when there's a little toughness in it (early morning with dew, or at night) so the leaves stay attached, and run the baler at a lower PTO speed to be gentler. Watch the "dry leaves, wet stems" trap that causes bales to heat and caramelize. If it's too tough to bale safely, your real options are wrap it as baleage, use a hay preservative, or wait — backing off bale pressure does not work.
Every other crop forgives a little. Alfalfa doesn't. Bale it a touch dry and the leaves shatter off in the chamber; bale it a touch tough and the bale heats, caramelizes, and can mold. The window is narrow, and round balers — with their churning chamber — punish leaf loss. Here's how experienced hands thread the needle.
Keeping the leaves on: moisture and timing beat everything
First, good news for round-baler owners worried they're losing more leaves than a square baler would — they usually aren't. As one operator with three round balers put it, "I've had three different round balers and they've all kept leaves better than the square balers." The bigger lever is your process, not the machine:
"For dry hay here we mow when the dew comes off, ted out either later that day or the next day after dew is off, and rake the following morning with dew on, baling that evening."
— wbstofer, North Central Indiana · AgTalk thread 711755
The thread running through every successful alfalfa routine is the same: rake and bale when there's a little toughness in the leaf — early morning while the dew is still on, or at night — never in the dry heat of midday when the leaves are crisp.
"Rake and bale in the early morning before it gets too dry. A lot of alfalfa is baled at night out here."
— Rowdy, North Central South Dakota · AgTalk thread 711755
Many operators watch humidity as their go/no-go signal — starting to bale as it climbs back toward 60% in the evening, when the leaves toughen up. A rake that handles the crop gently (and doesn't rope dry windrows) helps too; see our rake selection guide. And a moisture target: dry alfalfa goes up best around 16–18%. (A caution on testers below.)
Slow the baler down
The other leaf-saver is PTO speed. Running the baler slower is noticeably gentler on dry alfalfa leaves:
"Running the baler at a bit lower rpm seems to be a lot gentler on the bale than running at or near full PTO rpm… With this dry spell trying to make dry bales, the PTO rpm has a much greater effect on the alfalfa leaves left on the hitch."
— Jim, SW Wisconsin · AgTalk thread 711755
The net-wrap gotcha nobody warns you about: count drops at low PTO speed
Here's a detail worth the price of the whole article. If you slow the PTO down to save leaves and you run a John Deere baler, your net-wrap count is no longer what the monitor says. The same operator learned it the hard way:
"With a monitor setting of 2.0 wraps and engine rpm of 1500, I was getting an actual 1.5 or 1.6, which started coming off as I carried the bales out of the field… On page 40-24 of the operator's manual is a chart: if operating at less than rated PTO speed, at 1500 engine rpm use a setting of 2.9 to achieve an actual 2.0 wraps, and 4.3 to achieve 3.0 wraps."
— Jim, SW Wisconsin · AgTalk thread 711755
Why it happens: some John Deere balers meter net by time/turns of the roll tied to PTO speed, so spinning slower lays on less net than the dial claims. The fixes:
- John Deere without the speed-compensation kit: use the operator's-manual correction chart and dial in a higher number to get the actual wraps you want at reduced rpm. Deere offers a slip-clutch/speed-compensation kit that fixes this on some models.
- New Holland (BR series and newer): meters the actual length of net, so PTO speed has no effect on wraps applied.
Either way, the symptom is the same and important: too few wraps and your net starts peeling off as you handle the bale. If you're not sure how many wraps you should be running in the first place, see how many wraps per bale. Quality net helps here too — consistent, full-width net wrap spreads evenly to the bale edges so the wraps you pay for actually hold.
The "dry leaves, wet stems" trap and bale heating
The most common way good alfalfa goes wrong: the leaves feel dry, so you bale — but the stems are still wet inside. The bale then heats, and in the center it caramelizes.
"Dry leaves, wet stems. It's gotten me many times over the years."
— jfqc, SE Montana · AgTalk thread 1116446
Cool weather makes it worse — "cooler temperatures can fool you; the leaves are dry but not the stems." A few rules to stay out of trouble:
- Check stem moisture, not just leaf feel. Twist a handful of stems; if you can wring any dampness, it's not ready. Handheld testers are notorious for missing stem moisture — "this test doesn't pick up on stem moisture when everything else is crispy." Treat the meter as a guide, not gospel; see our hay moisture tester guide.
- Know the heat thresholds. As long as a bale stays under about 150°F the fire risk is low; above that, monitor closely and be ready to pull bales apart. Internal heating that keeps climbing past 170–175°F is a genuine fire hazard — our hay bale heating & fire prevention guide covers monitoring temperatures.
- Caramelized isn't the same as ruined — but it isn't free. Cattle love caramelized (tobacco-brown) alfalfa and will often eat it first, but the heat burns up part of the feed value, so it tests lower than it looks. Don't bale tough expecting to caramelize it.
- Once it's heating, it's too late to wrap. Wrapping preserves wet forage by fermentation, not by stopping a hot, oxygen-fed bale — "much too late for wrapping" once caramelization is underway. Decide wet-vs-dry at the baler, not afterward.
- Store to shed heat and air. Stack heating bales so they don't ignite something — either individually on the ground not touching, or jammed end-to-end tight to keep air out of the round sides. Don't put questionable bales in a building until they've gone through their heat.
Too tough to bale dry? Your three real options
When the hay's a little tough and rain's coming, the instinct is to "back off the bale pressure so they breathe out." It doesn't work:
"Backing off the pressure will only make a big flat-bottom sloppy bale."
— Red Cows, SE South Dakota · AgTalk thread 1066645
The three approaches that actually work:
- Wrap it as baleage. The cleanest fix if you have (or can hire) a wrapper. "I've wrapped the next day without any trouble — not ideal, but still good feed." Even hay that caught a sprinkle can be picked up and wrapped the next day. See wrapping wet hay.
- Use a hay preservative (propionic acid). Acid lets you safely bale tougher, and it works especially well on alfalfa — operators report baling 25–30% alfalfa with enough acid and getting "beautiful hay." Apply with an applicator/gandy box plumbed into the baler throat, or spray the windrow ahead of the pickup. Full detail in our hay preservative guide.
- Wait it out. Sometimes the right call is to let it get rained on and dry again rather than bale junk. "Good hay that's been rained on but left to dry afterwards can still be good hay. Your time, effort, and the hay are too valuable to screw up trying to beat a rain."
As the forum sums it up: "Pick your poison" — but backing off pressure and baling wet alfalfa into a dry stack isn't one of the choices that ends well.
Round-baling alfalfa, start to finish
- Mow, ted, and rake on a leaf-saving schedule — rake with dew on, bale in the evening or at night when the leaf is tough.
- Target ~16–18% for dry hay; check stem moisture, not just the leaf or the meter.
- Slow the PTO to save leaves — and correct your net-wrap count if you run a John Deere at reduced rpm.
- Watch for heating; store questionable bales spread out or tight end-to-end, never in a building until they've cured.
- Too tough? Wrap it, acid it, or wait — don't back off pressure and bale it dry.
Frequently asked questions
What moisture should you round-bale alfalfa at?
For dry hay, target about 16–18% moisture. Above roughly 18–20% without a preservative, the bale is prone to heating, caramelizing, and molding; much below 16% and the protein-rich leaves shatter off in the chamber. Check stem moisture, not just how the leaves feel — handheld testers often miss wet stems when everything else is crispy.
How do you keep alfalfa leaves from shattering when round-baling?
Bale when there's a little toughness in the leaf — early morning while dew is still on, or at night — rather than in the dry heat of midday. Rake with dew on, watch for humidity climbing back toward 60% in the evening as your signal, and run the baler at a lower PTO speed, which is noticeably gentler on dry leaves. Process matters more than whether you're using a round or square baler.
Why does my net-wrap count drop when I slow the baler down?
Some John Deere balers meter net wrap by roll turns tied to PTO speed, so running below rated PTO speed lays on fewer actual wraps than the monitor shows — a setting of 2.0 at 1500 engine rpm can deliver only 1.5–1.6 real wraps, which then peel off when you handle the bale. Use the operator's-manual correction chart (for example, dial 2.9 to get an actual 2.0 wraps at 1500 rpm), or fit Deere's speed-compensation kit. New Holland balers from the BR series on meter the net's actual length, so PTO speed doesn't affect them.
Is caramelized (heated) alfalfa still good to feed?
Partly. Cattle love caramelized, tobacco-brown alfalfa and will often eat it first, but the heat that browned it also burned up part of the protein and energy, so it tests lower than it looks. As long as a bale stayed under about 150°F the fire risk is low. Don't bale tough alfalfa expecting to caramelize it on purpose — you're throwing away feed value.
What should you do with alfalfa that's too tough to bale dry?
You have three real options: wrap it as baleage (even hay that caught a sprinkle can be wrapped the next day), bale it with a propionic-acid preservative (which works especially well on alfalfa and lets you safely bale 25–30% moisture hay), or wait and let it dry again. Backing off the bale pressure to "let it breathe" does not work — it just makes a sloppy, flat-bottomed bale that still spoils.
The XES Netting team manufactures bale net wrap for round balers and writes these guides so forage operators can find clear, source-cited answers. Every farmer quote in this post is verbatim with a link to the original AgTalk thread — go read the discussions in full.
Featured photo: Baling Hay near Mayall's Coppice by Bob Embleton, licensed under CC BY-SA 2.0, via Wikimedia Commons.
