I’ve sat through enough sales pitches from lads in clean tractors to know that most advice on how to make good silage is designed to sell you a more expensive inoculant or a fancy new chopper, rather than actually improving your winter stores. They talk about “optimising nutritional profiles” and “microbial efficiency,” but they never mention the fact that if your ground was a bog during the cut, all the additives in the world won’t save you from a pit of rot. I learned that the hard way back in ’94 when I spent a fortune on additives for a crop that was far too wet to ever ferment properly; I wasn’t just losing grass, I was throwing cash directly into the muck.
I’m not here to sell you a subscription or a chemical cocktail that promises the moon. What I want to do is strip the nonsense away and look at the three things that actually matter: the moisture in the stem, the tightness of your pack, and the timing of the weather. I’ll tell you exactly where I’ve bled money on bad harvests so you don’t have to, focusing on the practical realities of grass, feet, and cash flow.
Table of Contents
Understanding How to Make Good Silage

Before you even think about turning the tractor on, you need to look at the field. You can have the best equipment in the county, but if you’re cutting grass that’s already gone to seed or is bone-dry from a two-week spell without rain, you’re fighting a losing battle. The goal here is hitting that optimal moisture content for silage—usually somewhere between 60 and 65 per cent. Too wet and you’ll end up with a fermented mess that smells like vinegar; too dry and you won’t get the compaction needed to kickstart the anaerobic fermentation process. I’ve spent too many winters looking at a pit of wasted energy because I rushed the harvest during a dry spell.
Once it’s in the pit, the real work begins. It isn’t just about dumping it in a heap and walking away. Effective silage pit management comes down to how tightly you can pack that material to squeeze out every last pocket of air. If you leave gaps, you’re essentially inviting oxygen in, and once that happens, you’re just preventing aerobic spoilage from becoming a total write-off. I’ve learned the hard way that a poorly compacted pit is just an expensive way to grow mould.
Key Things to Know

First, you have to understand that you aren’t just storing grass; you are managing a biological reaction. The whole point of the anaerobic fermentation process is to create an environment where the good bacteria can do their work without the oxygen stepping in to ruin it. If you leave air pockets in that pit, you aren’t making feed; you’re growing mould. I’ve spent too many winters looking at a face of spoiled silage and knowing exactly how much money I’d just thrown into the muck because I was too lazy to pack it down tight.
Then there is the matter of the moisture. You can have the finest Ryegrass in the county, but if you miss the optimal moisture content for silage, you’re fighting a losing battle. Too dry, and you’ll never get the density needed to keep the air out; too wet, and you’re just making effluent that runs off and wastes your nutrients. It’s a narrow window, and if you miss it, you’ll be paying for it in forage quality assessment reports that tell you exactly what you already suspected: you’ve wasted a season’s growth.
Practical Tips and Steps

First, stop thinking about the grass as just “feed” and start thinking about it as a chemistry project that you’re paying for by the hectare. If you’re cutting too late, you’ve already lost the battle; the stem is too thick and the sugar is gone. You need to hit that optimal moisture content for silage—usually around 60 to 65%—before you even think about moving the machinery. If it’s too dry, you won’t get the compaction needed for a proper anaerobic fermentation process, and if it’s too wet, you’re just making expensive slurry. I’ve seen men spend thousands on fancy equipment only to ruin a crop because they were too lazy to check the dry matter.
Once it’s in the pit, your job isn’t done; it’s just getting harder. Efficient silage pit management comes down to one thing: speed and weight. You need to pack that material tight, layer by layer, or you’re inviting the air in. Once oxygen gets under that surface, you aren’t making feed anymore; you’re preventing aerobic spoilage from becoming a very costly reality. I’ve watched enough good grass turn to rot in a poorly compacted pit to know that a heavy tractor and a steady hand save more money than any fancy additive ever will.
Common Mistakes to Avoid
The biggest mistake I see is people treating the pit like a rubbish bin rather than a biological reactor. If you don’t get that optimal moisture content for silage right before you start packing, you’re fighting a losing battle. Too dry and you won’t get the squeeze needed for a proper anaerobic fermentation process; too wet and you’re essentially brewing a soup that’ll rot before you can even get the feed to the cattle. I’ve seen men spend a fortune on fancy machinery only to ruin the whole batch because they were too lazy to check the chop length or the moisture levels.
Then there’s the issue of how you seal it. You can have the best grass in the county, but if your silage pit management is shoddy and you leave gaps in the plastic, you’re just inviting aerobic spoilage to move in. Once the air gets in, the value of that crop drops faster than a heifer in a slaughterhouse. Don’t bother with expensive silage inoculant benefits if you haven’t mastered the basics of compaction and sealing first. It’s a waste of cash.
Final Thoughts
At the end of the day, you can buy the most expensive inoculant on the market and still end up with a pile of expensive rot if you ignore the basics. It’s easy to get caught up in the chemistry of the anaerobic fermentation process, but that science only works if you’ve done the heavy lifting with the tractor first. If you haven’t achieved the right compaction or if you’ve let the moisture levels drift, you aren’t making feed; you’re just managing a slow-motion disaster.
I’ve spent too many winters looking at wasted tonnage to tell you otherwise. My advice is simple: stop looking for a magic fix and start looking at your ground and your timing. A proper forage quality assessment during the growing season will do more for your bottom line than any fancy new piece of kit sitting idle in the shed. Watch your moisture, watch your packing, and for heaven’s sake, don’t rush the clamp. If you get the foundation right, the rest usually takes care of itself. If not, you’ll be paying for that mistake every time you open the pit.
Five ways to stop feeding your cattle rot
- Watch the sky, not just the grass. You can have the finest ryegrass in the county, but if you try to chop it while the ground is sodden and the air is heavy with rain, you’re just making expensive slurry. Wait for a dry window, even if it means losing a few days of growth; a slightly late chop is better than a pit full of liquid waste.
- Don’t get greedy with the chop length. I’ve seen lads try to save time by leaving the material too long, thinking it’ll pack better. It won’t. If you don’t have enough fines to fill those air pockets, you’re just inviting mould to move in and take up residence.
- The weight of the clamp is your best friend. If you aren’t driving that tractor over every single layer until it’s as tight as a drum, you aren’t making silage; you’re just stacking hay. Air is the enemy of every penny you’ve put into that field, so pack it down hard and pack it often.
- Seal it like you mean it. I’ve lost more money to a poorly stretched sheet than I ever have to bad weather. If you see a wrinkle or a gap, fix it immediately. A single hole in your plastic is an open invitation for the elements to turn your winter feed into a heap of useless, stinking compost.
- Check your moisture before you commit. If the grass is too lush and wet, you’ll end up with a pit that’s more juice than feed. If it’s too dry, it won’t ferment properly. It’s a narrow margin, and if you don’t get the balance right, you’ll spend the whole winter wondering why your cows’ condition is dropping despite the full troughs.
The Bottom Line on the Pit
Don’t get blinded by the fancy new machinery; if you don’t get the moisture right and pack that pit tight enough to squeeze the air out, you’re just paying to grow expensive rot.
Watch the weather more than the spreadsheet—if you’re cutting into a wet spell just to stay on schedule, you’ll spend the next six months paying for the mistake in wasted feed and poor cow performance.
Silage isn’t a “set and forget” job; it’s a cash flow game, and every hour you spend neglecting the seal or the compaction is an hour you’re bleeding money straight out of the farm gate.
The Bottom Line on the Pit
At the end of the day, making good silage isn’t about following some fancy new chemical protocol or buying the most expensive inoculant on the market; it’s about the basics. It’s about getting the chop right, monitoring your moisture levels like your bank balance depends on it, and ensuring that pit is packed tight enough to leave no room for air to settle in. If you neglect the packing or let the moisture slide, you aren’t just making bad feed—you are literally throwing money into a pit of rot. I’ve seen enough wasted silage to know that a mistake made in the field during July becomes a massive drain on your cash flow come February when the cows are hungry and the grass is gone.
Farming has always been a game of managing risks we can’t control, like the weather or the price of beef, but the quality of your winter stores is one thing you can actually get a handle on. Don’t get distracted by the shiny new kit or the latest marketing hype; focus on the grass, the moisture, and the seal. If you get the silage right, you’ve secured your foundation for the year ahead. It’s not glamorous work, and it’s often a race against the rain, but doing it right the first time is the difference between a profitable season and one where you’re just working to break even.
Frequently Asked Questions
If the weather turns and I’m forced to cut late, is it better to take the hit on dry matter or try to salvage it with more additives?
If the weather turns and you’re staring at a late, stemmy crop, don’t go throwing money at additives hoping for a miracle. Most of those powders are just expensive ways to mask poor management. If the dry matter is too high, you’ve got a fermentation problem, not a chemistry problem. You take the hit on the quality, manage your feeding plan for the winter, and save your cash flow for something that actually works.
At what point does the cost of high-quality inoculants actually pay for itself in the winter, or is it just another bit of marketing fluff?
It pays for itself the moment you look at your winter feed bill. If you’re running a suckler herd, you aren’t just buying a bag of microbes; you’re buying insurance against a pit of fermented rot. If the inoculant saves you even 5% of your forage from spoiling or keeps the dry matter consistent enough that you aren’t feeding out extra concentrate to make up the gap, it’s paid for. Otherwise, it’s just expensive perfume for your grass.
How much of a difference does the actual chop length make to the fermentation if I'm already struggling to pack the pit tight enough?
If you aren’t packing that pit tight enough, the chop length is the least of your worries. You can have the finest, most uniform chop in the county, but if there’s oxygen trapped in those gaps, you’re just growing mould, not silage. It’s a losing battle. Get the compaction right first—get that air out—otherwise, you’re just paying for expensive, fermented rot. Fix the packing; the chop length only matters once the pit is airtight.




































