Crop drying is the process of reducing the moisture content of harvested grain, oilseed rape, or other combinable crops to a safe level for long-term storage. It is one of the most important steps in the post-harvest process and has a direct impact on crop quality, profitability, and storage life.
Why is crop drying necessary?
When crops are harvested in the UK, they often come off the field at moisture levels well above what is safe for storage. Wheat may be harvested at 18–22% moisture, when it needs to be below 14.5% for safe long-term storage. Without drying, grain stored at high moisture levels will deteriorate rapidly. Mould, mycotoxins, and insect activity can all take hold within days, causing significant financial loss and making the grain unfit for sale or use.
What happens if grain is not dried properly?
Storing grain at too high a moisture level leads to a range of serious problems. Mould growth produces mycotoxins which can render grain unsellable and may pose a health risk to livestock. Heating within the grain heap can cause hot spots, accelerating spoilage. Weight loss through shrinkage reduces the tonnage available for sale. In severe cases, the entire store can be lost. Proper crop drying eliminates these risks and protects the value of the harvest.
How does crop drying work?
Crop drying works by forcing air — either ambient or heated — through a heap of grain stored on a perforated floor. As air passes through the crop, it carries moisture away. The key variables are air temperature, airflow rate, and the ambient humidity of the incoming air. Managing these correctly is what separates efficient drying from slow, costly, or damaging drying. At Harvest Installations, our Constant Humidity Controller (CHC) has been doing exactly this since 1979 — automatically modulating the gas burner to maintain the ideal drying conditions 24 hours a day.
Which crops need drying?
Unless harvest conditions are near perfect, most combinable crops will require drying. Wheat, barley, oilseed rape, and oats are the most common, but the same principles apply to a wide range of other crops. Onions in particular benefit significantly from controlled drying — after lifting, they need to be cured and dried down to a stable moisture level to prevent rot, skin damage, and storage losses. Maize, which is typically harvested at a much higher moisture content than cereals, also requires substantial drying before it can be safely stored. The target moisture level varies by crop type and intended use, but the underlying need — to remove excess moisture quickly and efficiently after harvest — is universal.
How can Harvest Installations help?
Harvest Installations has been designing, supplying, and installing crop drying equipment across the UK since 1979. From our award-winning Constant Humidity Controller to our Maxi-Stirrer grain aeration systems and store controls, we provide everything farmers need to dry and store their crops safely and efficiently. We manage projects end-to-end and bring over 40 years of specialist knowledge to every installation.