An onion cold storage room is a controlled environment specifically designed to store onions in a way that preserves their quality and prolongs their shelf life. Onions are sensitive to temperature, humidity, and light, and improper storage can cause them to sprout, decay, or lose flavor. A cold storage room helps prevent these issues by maintaining the ideal conditions for long-term storage.
Storing onions in a cold storage room is a common practice to prolong their shelf life and maintain their quality. However, onions require specific conditions to avoid sprouting, spoilage, or softening. Here are key considerations for onions in cold storage room:
Onions cannot be stored immediately in cold storage room after the harvest. First, onions need to be dried for a few days. Then starts the maturing stage that enables skin and colour formation specific to the onion cultivar. Onions are prepared for cold storage room by lowering the temperature at maximum by 0.5 °C per day to reach the ideal cold storage temperature little by little. Depending on the onion variety, they are stored at between 0 °C and +2 °C in cold storage room. Onions can be stored in cold storage room up to ten months without deterioration. Ventilation is vital in onion storage. After storing, onions are not transported straight from the cold storage room before they are put on the market, but heated in temperature-controlled conditions in order to prevent condensation.
1. Temperature control
Onions are best stored at low temperatures, and the recommended temperature is between 0°C and 4°C. By precisely controlling the temperature of the cold storage room, the shelf life of onions can be extended.
2. Humidity regulation
Onions have high requirements for humidity, and the appropriate humidity range is 65% to 70%. Maintaining an appropriate humidity level in the cold storage room can reduce the water loss of onions and extend their shelf life.
3. Ventilation and preservation
Good ventilation can effectively remove carbon dioxide and ethylene gas inside the cold storage room, slow down the metabolism of onions, and extend the shelf life. At the same time, ventilation also helps to maintain the humidity balance inside the cold storage room.
4. Moisture-proof treatment
Onions are easily affected by moisture and rot, so moisture-proof treatment should be paid attention to. When storing onions, use packaging materials or mesh bags with good air permeability to avoid direct contact with the ground to prevent moisture intrusion.
5. Partition storage
Onions can be stored in cold storage room according to the type and maturity of onions. Storing onions with higher freshness separately from mature onions is conducive to extending the shelf life of fresh onions.
6. Regular inspection
Regularly inspect the storage status of onions and remove rotten or spoiled onions in time to prevent rotten onions from affecting the surrounding healthy onions.
Onion cold storage rooms are commonly used by farmers, distributors, and grocery stores to extend the shelf life of onions, especially when they are harvested in bulk or stored for distribution during off-seasons.
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