Safe Storage Moisture for Wheat, Barley and Canola in Australia
Receival limits, long-term storage targets and why canola needs a lower moisture than cereals — a quick reference for Australian growers.
SiloSense IQ ·
“Safe” moisture depends on what you’re storing, how long you’re storing it, and how warm it is. Here’s a practical reference for the three crops most Australian storage sites hold.
The numbers
| Crop | Receival maximum | Long-term storage target |
|---|---|---|
| Wheat | 12.5% | about 12% |
| Barley | 12.5% | about 12% |
| Canola | 8% | about 7% |
Receival maximums are Grain Trade Australia standards — deliver above them and you risk rejection or a discount. The long-term figures are the margin storage operators commonly aim for when grain will sit for months, because a little headroom below the limit buys a lot of safety.
Always check your buyer’s specification: some contracts and end uses are tighter.
Why canola is so different
Canola is an oilseed. Oil doesn’t hold water, so the water in a canola seed sits in a smaller non-oil portion of it. At the same moisture percentage, canola is “wetter” from the point of view of moulds and the seed itself than a cereal grain is. That’s why its limit is 8% rather than 12.5%.
In practice, canola stored at a moisture that would be perfectly safe for wheat can heat and spoil. Treat a canola silo as its own case — not as “grain”.
Moisture and temperature work together
Moisture alone doesn’t tell you whether grain is safe. Warm grain at a borderline moisture is far riskier than cool grain at the same moisture:
- Insects breed fastest in warm grain and slow dramatically as it cools below about 20°C.
- Moulds need humid air around the kernels; warm, moist grain gives them both water and speed.
That’s why the advice is always dry enough and cool enough. Getting grain to a safe moisture and then aerating it down in temperature protects it far better than either step alone.
Average moisture can hide a wet layer
A silo isn’t one moisture. Grain harvested across different days, from different paddocks, or loaded during a damp evening can sit in layers. A sample from the top or the outlet tells you about that spot, not the whole silo. A silo averaging 12% can still have a band at 13.5% — and that band is where trouble starts.
Keep watch on every level
SiloSense IQ calculates grain moisture at each sensor level from temperature and humidity, for 12+ commodities, so you see the wettest layer — not just an average. You can set the crop for each silo, and the dashboard judges it against that crop’s own limits.
If you’re drying or holding grain at a target, SiloSense IQ+ uses the same crop limits to run aeration automatically.
Request a demo to see your crops on the dashboard.