Lodging in Cereals: Understanding the Risk

What Causes Lodging?

Lodging is influenced by a mix of genetic, agronomic, and environmental factors. These include:

• Excess nitrogen applications, which encourage lush growth and taller plants with weaker stems.
• High seed rates that create denser canopies, increasing competition for light and encouraging vertical elongation.
• Weather events—especially heavy rainfall and strong wind—often trigger the physical collapse of the crop.
• Soil conditions like poor root anchorage or shallow rooting can also be contributing factors.

This situation can vary dramatically between seasons, fields, and varieties.

Field Signs and Timing

Lodging doesn’t always show up immediately. The risk can build silently through the season.

• Crops with thin, leggy stems and dense foliage are a giveaway, especially in nitrogen-rich soils.
• Lodging often appears around the milk to dough growth stages, and tends to be patchy at first before spreading.
• It’s not just yield loss that matters—the quality drop from sprouting and disease infection in lodged crops is often worse.

Reducing the Risk of Lodging

There is several practical tactics used on farms to reduce the chance of lodging:

1. Balanced Nitrogen Management

Excess nitrogen may boost yield potential—but if not managed correctly, it can lead to floppy plants. Splitting nitrogen applications and avoiding overfeeding early in the season is emphasized as good practice.

2. Growth Regulators or Potassium Silicate

Plant growth regulators (PGRs) are a central part of lodging control in conventional farming. Used correctly and at the right timing (often between GS30 and GS39), they reduce stem height and thicken stem walls. Regenerative farmers are exploring alternatives to synthetic PGRs, such as Potassium Silicate. Silica deposits in the cell wall increase rigidity in the stems and thus increase resistance to lodging.

3. Variety Selection

Some cereal varieties are simply more prone to lodging than others. The key is knowing the genetics—and reading lodging scores carefully, is key when planning rotations.

4. Timely Harvest

Lodging becomes more likely the longer a crop stays in the field beyond maturity. Prioritizing lodging-prone fields for early harvest can limit the damage.

Lodging Isn’t Just Cosmetic

Lodging isn’t just a headache for the combine, it also leads to:

• Reduced grain fill
• Poor sample quality
• Increased risk of sprouting
• Soil-borne contamination and disease risk

Yield maps of lodged fields often show dramatic drops—making it not just a risk to manage, but a cost to prevent.

Conclusion

Lodging is a complex issue with no single solution, but this blog makes it clear that thoughtful nitrogen use, variety choice, PGR/potassium silicate timing, and harvest strategy all work together to limit its impact. With the right approach, growers can protect both yield and quality—even in years with high lodging pressure.

Article by Dr Russell Sharp

If you would like to keep up to date with subjects just like this, you can listen to both our podcasts! Links can be found bellow:

Cereal Killers Podcast: https://t.co/eSEbBkTVHl

Hydroponics Daily Podcast: https://open.spotify.com/show/207T7p7fw9sPjINfSjVXW2