How Is a Good Silage Pit Packed?

Seeing your quality silage spoil is frustrating and costly. Poor packing methods waste feed and money. But a few simple techniques can lock in nutrients and prevent massive losses.

To pack a good silage pit, start unloading 10 meters from the front and build a 30-degree slope. Spread the silage in thin layers of 15-20 cm. Use a heavy loader, overlapping each pass by half a tire width, and always use a quality silage additive.

I've seen my fair share of silage pits, both good and bad. The difference often comes down to the details. It's not just about piling it high; it's about a systematic process. Let's break down exactly what that process looks like, step-by-step, so you can avoid common mistakes and get the most out of your harvest.

How should you start filling and layering the silage?

Just dumping silage in the pit seems easy, right? But this leads to air pockets and spoilage. A strategic start ensures a solid, dense pack from the very beginning.

Start by unloading the first truck about 10 meters from the front wall. Push this material forward to create a progressive wedge, or a 30-degree slope. Then, continue filling in thin layers, each no more than 15-20 cm deep, to ensure thorough compaction.

The reason you start away from the front wall is to give your equipment room to work. Pushing the silage forward to build a 30-degree slope is called the "progressive wedge" method. This is much safer and more effective than creating a steep, unstable pile. Once this slope is established, every subsequent load should be spread in a thin layer over the top. I can't stress this enough: thin layers are critical. A thick layer traps too much oxygen, and the tractor's weight can't squeeze it all out. A thin layer allows for maximum air removal with each pass of the tractor. This systematic approach sets the foundation for high-quality silage from the bottom up.

What's the best way to pack the edges and slopes?

The center of your pit feels solid, but the edges are often soft and spoil first. This common problem can be solved with a better packing technique.

Pay close attention to the edges and slopes, as they are prone to low density. The best practice is to use a "U-shaped" packing pattern, driving up one side, across the middle, and down the other. This ensures the sides get as much pressure as the center.

The edges are always the weak point. They don't get the same traffic as the middle, so they end up less dense and full of air. I've seen farms lose the outer foot of silage on both sides of a pit, which adds up to a huge financial loss over time. The U-shaped pattern solves this. By driving up one side, straight across the top, and down the other, you force the tractor's tires to run right along the bunker walls. This gives the edges the same compaction as the rest of the pile. Contrast this with just driving up and down the middle, which neglects the sides completely. Remember to keep the silage pile slightly crowned in the middle so that it sheds rainwater after it's covered.

What equipment should you use for packing, and how?

Using the wrong tractor or a poor technique can ruin your packing efforts. It's not just about weight; it's about applying that weight correctly and consistently.

Use a heavy loader; a 50-type loader is the minimum. Never use excavators or light electric vehicles. When packing, overlap each pass by half a tire width to ensure even compaction. Avoid repeatedly driving over the exact same spot, as this is inefficient.

Weight is your best friend when packing silage. A heavy machine is essential to achieve the target density needed to squeeze out oxygen. A 50-type wheel loader is a good starting point. Lighter equipment, like farm tractors or electric vehicles, simply can't do the job. Excavators are also a bad choice because their tracks concentrate pressure in small areas instead of distributing it evenly. The technique is just as important as the machine. You should overlap each pass by about half a tire's width. Think of it like mowing a lawn—you overlap each row to make sure you don't miss any spots. This systematic approach ensures the entire surface of each thin layer gets compacted evenly. The machine is just a tool; the operator's technique determines the final quality.

Are silage additives really necessary?

You might see additives as an extra cost. But what if they could prevent much larger financial losses from spoilage and improve your feed quality at the same time?

Yes, silage additives are a necessary investment. They speed up fermentation by introducing beneficial bacteria. This quickly lowers the pH, inhibits the growth of spoilage microbes¹ like yeasts and molds, and ultimately improves the final feed quality and digestibility for your herd.

Think of a silage additive as a starter culture. You are giving the "good" bacteria a massive head start in the race against the "bad" bacteria, yeasts, and molds. The whole point of making silage is to preserve the crop through fermentation, which drops the pH and makes the environment acidic. In this acid, spoilage organisms can't grow. Additives make this process happen much faster and more efficiently. This is especially important when crop conditions aren't perfect, like when it's too wet or too dry. I used to be skeptical, but after comparing silage made with and without additives, the difference is clear. The silage with additives smells sweeter, has less visible waste, and supports better animal performance. It is a small investment that pays for itself many times over.

Conclusion

Proper silage packing isn't complex. By focusing on layering, systematic packing, using the right equipment, and applying additives, you can ensure high-quality feed and eliminate costly waste.