The demand for potato cold storage is high for the last many years. It is because, in the potato, fruit, and vegetable sector, it is extremely important that storage is perfectly regulated and that all requirements are met.
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Temperature is the most important factor in maintaining the quality of stored potatoes. It influences respiration, germination, water loss, relative humidity, the chemical composition of tubers, and the occurrence of storage diseases.
Through respiration, the tuber absorbs oxygen and releases carbon dioxide, volatile gases, water, and heat. Respiration is minimal at 7.2oC, and it increases above and below this temperature.
Potato cold storage below 3oC and above 15oC is not recommended, as these temperatures greatly increase respiration. A temperature as low as 2oC can be tolerated by some varieties. And sometimes it needs to be kept at this level to prevent germination. Bruising, sprouting, and immaturity also increase respiration and should be avoided.
The dormant period during storage is a function of the variety, temperature, and physiological age of the tubers, and all of these factors vary from year to year.
Potatoes stored below 4oC usually remain dormant for a normal period of storage (up to eight months). Some varieties require a temperature below 3oC to completely suppress germination.
When the temperature is above 4oC, the dormancy period decreases as the temperature rises. Potatoes for consumption and processing which must be kept at a temperature above 4oC for more than two months must be treated with an anti-sprouting agent. The temperature must remain stable because any variation shortens the period of dormancy.
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Scarring and suberization are necessary for the formation of good skin capable of reducing water loss and the risk of rotting. When the potatoes are dry and in good condition, pre-storage begins shortly after the warehouse is filled.
Bring the temperature of the pile to 13-15.5oC, and keep it there for 10-14 days with a relative humidity of 92-97%. It may be necessary to extend the pre-storage of processing potatoes from 4 to 5 weeks to improve color; perform color tests on samples every week during this pre-stocking period.
Limit ventilation to one or two hours per day, which is sufficient to ensure a good supply of fresh air without changing the ambient conditions. The humidifier must operate during ventilation. Get in touch with us and know about the potato cold storage price.
Very hot (over 20oC) or very cold (less than 7oC) potatoes in storage should be cooled or reheated at 2 to 3oC per day to pre-storage temperature.
The humidifier may be on during this period when the tubers are dry and free from disease; this is especially important when the weather is hot and dry at harvest, as the risk of black spot and subsequent Fusarium wilt infection is greatest.
When there is a risk of soft rot due to late blight, frost, pink eyes, blackleg, or excess moisture, the potatoes must first be dried. Without running the humidifier, ventilate the pile with dry air until the risk of loss is gone, which takes several weeks or even months in some cases.
When the crop has been severely damaged by frost or disease, reduce the temperature of the pile to 8 or 9oC and keep it there for three to four weeks before cooling it again to 3 or 4oC.
The low temperature prevents the spread of pathogenic organisms and improves drying.
Finally, remember that there are various potential problems to be reckoned with every year. It is therefore prudent to continuously ventilate the warehouse for a few days before storage, time to assess the quality of the crop, and to create uniform conditions in the pile. The humidifier can operate during ventilation when the crop is in good enough condition, otherwise, it is kept closed. At Natural Storage Solutions Pvt.Ltd., we will quote you for potato cold storage price.
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To keep the potato at a low respiration level, it is necessary to cool them by ventilation or refrigeration at the start of potato cold storage and to ensure the regular elimination of the heat produced.
Respiratory intensity increases with:
- Temperature (between 4 ° C and 8 ° C, respiratory intensity is minimal),
- The size of the tubers,
- The number of manipulations undergone by the tubers before storage,
- The number and extent of injuries.