Dry Onions
Recommended
Conventional cooling
Dynamic Cooling
Pre-cooling
De-greening
Ripening
General Tips for Dry Onions
| Storage temperature | Relative Humidity (RH) | Duration | Pre-cooling | Sensitivity to ethylene | Ethylene Production | Controlled Atmosphere |
|---|---|---|---|---|---|---|
|
Storage temperature:
-0,2° to 0,5° C
|
Relative Humidity (RH):
72%-76%
|
Duration:
8-10 months
|
Pre-cooling:
Not required
|
Sensitivity to ethylene:
Low
|
Ethylene Production:
Very low
|
Controlled Atmosphere:
Not recommended
|
Dynamic Surface Drying (Essential): Before long-term storage, onions must be thoroughly dried in specialized cold rooms equipped with ventilation ducts and air-control systems. |
Dynamic Cooling: Monitors and regulates all critical storage parameters at multiple points throughout the chamber 24/7, extending storage life by 15%–20% beyond conventional systems. |
IMPORTANT TIPS
- Dynamic Cooling is essential for preserving onion quality during long-term storage.
- Avoid prolonged high temperatures during the pre-storage drying phase.
- Do not store onions that were exposed to excessive humidity during cultivation.
- Controlled drying can be performed directly inside the cold room by adjusting ventilation and humidity levels.
- Delay the temperature drop below 10°C at the start of storage to promote the formation of additional protective skins.
- Maintain drying conditions at 18°–25°C and 40% RH during the first five days after loading the cold chamber.
- Use low-humidity refrigeration systems.
- Remove ethylene via specialized ventilation systems.
- Maintain moderate CO₂ levels to prevent spoilage and preserve onion quality.
- Ensure continuous air recirculation within the chamber using independent fans, operating 24 hours a day.