Fresh Onions
Recommended
Conventional cooling
Dynamic Cooling
Pre-cooling
De-greening
Ripening
General Tips for Fresh Onions
| Storage temperature | Relative Humidity (RH) | Duration | Pre-cooling | Sensitivity to ethylene | Ethylene Production | Controlled Atmosphere |
|---|---|---|---|---|---|---|
|
Storage temperature:
0° – 0,2° C
|
Relative Humidity (RH):
95%
|
Duration:
4-6 weeks
|
Pre-cooling:
Air cooling
|
Sensitivity to ethylene:
Low
|
Ethylene Production:
Very low
|
Controlled Atmosphere:
Not recommended
|
Dynamic Pre-Cooling (Low-Pressure / Wet-Bulb Chambers): Specialized pre-coolers designed for bulk, unpackaged vegetables immediately after harvest. They maintain high humidity and low atmospheric pressure, ensuring rapid and uniform temperature reduction. |
Natural Airflow Cold Room – Mist Atmosphere: A highly specialized storage chamber where gentle natural airflow combined with fine misting maintains the optimal microclimate for highly sensitive produce requiring high relative humidity. |
Low-Airflow Cold Room with Continuous Water Circulation: Advanced chamber type designed for crops requiring extremely high humidity and low air movement (<25 air exchanges/hour). Humidity is maintained through continuous water circulation. |
IMPORTANT TIPS
- Pre-cool quickly in Dynamic Pre-Cooling chambers and maintain the cold chain throughout all transport and handling stages.
- Maintain medium CO₂ levels (around 5%) to help preserve quality and extend storage life up to 8 weeks.
- Wash fresh onions in basins of cool water and disinfect using approved, low-residue sanitizers.
- Dry with cold air immediately after washing.
- Install ozone generators to suppress fungal activity.
- Avoid storing alongside ethylene-producing products (e.g., apples, tomatoes, or pears).