Carefully harvested apples for storage need to be picked on a sunny day and dried in the morning dew. Do not pick in the morning when the temperature is below 2 ° C, otherwise it will not be stored. Handle with care when harvesting to prevent injury to the fruit surface, and strictly select disease, insect, broken fruit, ground fruit and small fruit.
Post-harvest treatment with 3% ～ 6% calcium chloride solution to immerse the fruit can increase the hardness of the fruit and reduce calcium deficiency such as bitterness caused by calcium deficiency during the storage period of the fruit; immerse 0.5% in 250% solution ～ 1 minute or 300-500 times solution of 70% methyl tobbutin to soak the fruit can prevent saprophytic fungus from infecting the fruit during storage.
Pre-chilled apples treated in situ are scattered in the orchard for pre-cooling and cooling overnight, then classified and packed into a warehouse.
In the last two years of improved packaging, the use of plastic film storage bags to store apples has an ideal effect. The principle is: rely on the breathing of the fruit to reduce oxygen, increase the concentration of carbon dioxide, and use the permeability of the plastic film to the gas to change the storage environment Gas composition to achieve spontaneous atmosphere control. Apples are stored for 3 to 6 months by this method, and the loss rate is not more than 5%. The method is to choose a non-toxic polyvinyl chloride plastic film bag with a thickness of 0.04 to 0.07 mm to line the fruit box. After the apples are lined up, fold the bag opening and seal it inside the box. Be careful not to tighten the bag opening.
Apples that are stored in time are respiratory transitional fruits. After being harvested and placed at normal temperature, the amount of ethylene produced will increase many times. Using a gas analysis instrument, the amount of ethylene produced can be increased from 22 ppm to 1680 ppm by 10 to 17 days after harvest. , Respiratory changes occur, the fruit begins to age and lesions occur. If fruit firmness is used as an indicator, if the apple is left at room temperature for one day after harvest, its cold storage life will be reduced by more than 20 days. Therefore, Apple should be put in storage in time after packaging.
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