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Fresh Onions

Recommended

Conventional cooling

Dynamic Cooling

Pre-cooling

De-greening

Ripening

General Tips for Fresh Onions

Storage temperatureRelative Humidity (RH)DurationPre-coolingSensitivity to ethyleneEthylene ProductionControlled 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).