Kiwifruit low temperature modified atmosphere account storage
The big account is a simple atmosphere storage, its obvious features are: simple method, easy to master; simple facilities, simple and easy to operate, is an economical atmosphere storage method. Full Body Red Light Therapy Mat
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1, reference storage indicators
1-1 Storage temperature -0.5～0.5°C
1-2 relative humidity 90% to 98%
1-3 gas composition O2 2 to 3%; CO2 4 to 5%
1-4 Ethylene content C2H4<0.02μL/L
1-5 storage life of 6 to 8 months
2, variety characteristics
Kiwifruit kiwifruit has a wide variety, and the highest economic value is Chinese kiwifruit (also known as soft kiwifruit) and delicious kiwifruit (also known as bristled kiwifruit). "Hayward" and "Qinmei" are delicious kiwifruit. Kiwifruit is a kind of paddle with a peak of breathing. It is difficult to store for a long time at normal temperature. In the ordinary cold storage conditions, "Hayward" and "Qinmei" can be stored for more than two months in the low ethylene gas storage. It can be stored for 6-8 months. Because kiwifruit is very sensitive to harmful gases, it should be stored separately during storage. It should not be mixed with apples, pears, bananas, etc., or mixed with garlic, onions and other vegetables. The quality is lowered due to mutual odor. If the oxygen is too low or the concentration of carbon dioxide is too high, it will cause great damage to the fresh fruit. Therefore, the gas composition must be strictly controlled during storage.
3, low temperature air conditioning large account storage:
1) The equipment is selected from transparent polyethylene or non-toxic polyvinyl chloride with a thickness of about 0.2mm as a rectangular account, which is shaped like a double net, which can be enlarged or reduced according to the amount of stored fruit. Generally, the storage of each account is 2~3. Tons are suitable. In the middle of the account is a small window of moderately sized silicone rubber cloth. The window opening area can be determined according to the amount of storage and the temperature of the storage. Generally, when the fruit is stored at 0 °C, the window opening area is about 0.4 m2.
2) The account installation account consists of two parts: the bottom of the account and the top of the account. When installing, choose a rectangular block slightly larger than the bottom of the account according to the storage and the height of the stack, and dig a small ditch of about 10cm deep and wide. Paving the bottom of the ditch, put some bricks for the fruit box or flatten the sand on the bottom of the account (pay special attention not to puncture the bottom) and then put the pre-cooled fruit box on the brick, coded into a ventilated raft. Then, the top of the account is buckled on the raft, and the bottom is tightly wrapped with the bottom of the account, buried in the small ditch, pressed with soil to prevent air leakage, and the big account is best supported by steel and wooden nets. The top of the account should be made into a ridge or arch shape. After the account is closed, the condensed water on the top of the account can flow into the bottom of the account along the wall to avoid direct erosion of the peel on the fruit. Several air intake holes can be opened on the account, and the air intake holes are composed of a bicycle valve core for taking air and sealing.
3) The best storage conditions for storage management of kiwifruit are: temperature -0.5 ~ 0.5 ° C, relative humidity 90 ~ 98%, oxygen content 2 ~ 3%, carbon dioxide content 4 ~ 5%, ethylene trace or no, all management measures should be For the purpose of reaching or approaching this indicator, the minimum O2 should not be less than 1.5%, so as to avoid anaerobic respiration; CO2 should not be higher than 5% to avoid CO2 poisoning. This storage method should be used in conjunction with refrigerators and gas conditioning equipment. The plastic film generally has a large humidity, and does not need to be humidified separately. The gas component mainly relies on the gas-conditioning device to quickly adjust nitrogen, and at the same time, the closed cycle can also partially remove carbon dioxide. For the removal of C2H4 ethylene, the simple method is to remove the ethylene with a preservative, or to carry the ethylene out of the warehouse by gas circulation dilution. In order to accurately grasp the change of gas composition in the account, gas should be taken for measurement every 1~2 days. If the carbon dioxide is too high, fresh gas should be replenished in time to adjust the gas content in the account. In addition, the external sensory traits, weight loss, fruit hardness, soluble solid content, mildew and other indicators of fresh fruit should be tested and analyzed regularly to guide storage management.
4) Equipment management Before the fruit is put into storage, it is necessary to carry out a comprehensive inspection and test of all equipment, master the operation of the equipment, ensure the normal operation of the fruit bank, and mainly check the refrigeration equipment, gas control equipment, pipelines and other facilities. Other aspects of management such as warehouse management, sanitation management, and safety management are the same as those for cold storage, and will not be repeated here. Please refer to the relevant technical literature.
references:
1. "The regulation of fruit, vegetable and flower atmosphere storage and post-harvest technology" Du Yukuan, Yang Dexing
2. "Air-conditioning storage and gas storage library" edited by Zhang Yuyou 
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