Onions can withstand low-temperature storage. Proper storage management can significantly extend their shelf life. Onions stored in a cold storage environment benefit most when you closely control temperature, humidity, and ventilation. This is particularly crucial. In fact, we maximize the shelf life of onions stored in a cold storage facility when we manage all these factors well.
Before storage, pre-treatment should be carried out. Select high-quality onions that are plump, undamaged, rotten, and free from pests and diseases. Also, remove damaged, rotten, and deformed onions. Spread the onions flat in a well-ventilated and shady place to dry thoroughly. Remove the outer dry skin and excess moisture to prevent mold and rot caused by storing them damp. After drying, grade and pack them into breathable mesh bags or perforated turnover baskets. Do not seal them tightly and stack them. For best results, these steps ensure onions stored in a cold storage system remain fresh.
The ideal temperature for cold storage is between 0℃ and 2℃. Temperatures should not be too low to prevent frost damage and sprouting, nor too high to accelerate aging and spoilage. The relative humidity in the storage room should be maintained between 65% and 75%. Excessive humidity promotes mold growth and rot, while insufficient humidity causes onions to dry out and shrivel. As a result, onions stored in a cold storage setting retain their quality much longer.
When stacking onions, ensure adequate ventilation channels are available. Arrange them in layers and avoid placing them directly against the cold storage walls or floor. In addition, keep them away from the air vents of the refrigeration unit to prevent direct drafts that could cause localized frost damage. Regularly operate the cold storage ventilation system to remove carbon dioxide and humid air. This maintains air circulation.
During storage, conduct regular inspections and promptly remove any spoiled, sprouted, or softened onions to prevent cross-contamination of pathogens. Strictly control temperature and humidity. Minimize frequent opening and closing of the storage room doors to prevent alternating hot and cold air intrusion that could damage the storage environment. With proper management, onions can be kept fresh for extended periods in cold storage. This preserves their original taste and quality to the greatest extent possible and minimizes storage losses. Ultimately, onions stored in a cold storage environment always have better post-harvest outcomes.
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