What is the suitable temperature for storing apples in cold storage?

Apple: It is a deciduous tree. Usually, trees can be as high as 15 meters, but the height of cultivated trees is only about 3-5 meters. The trunk is grayish brown and the bark has fallen off to some extent. The flowering period of apple trees depends on the local climate, but it is generally concentrated in April-May. Apple is a cross-pollinated plant, and most varieties cannot bear fruit by themselves. Generally, the suitable storage temperature of mid-late ripening apples is 0℃ and the relative humidity is 90% RH. After picking, precool the harvested fruits in the open air (in the shade) for one night and put them into storage in the morning. The freezing point of apple itself is about-1 to-1.5 degrees, but different varieties have different requirements for temperature during storage, and the sensitivity of the same producing area to low temperature is actually different. For example, the suitable temperature of ruby apple is about zero, and that of Guoguang apple is about -2. The suitable temperature of red marshal apple is about-1 to -2 degrees, so it is very important to build a small cold storage. Only in this way can apples reach a certain temperature during storage. Xue Hui Refrigeration suggested that the humidity of small cold storage should be controlled at about 92% during storage. After storage, the temperature before fruit stacking will drop to about 50 C. Before warehousing, the warehouse will be disinfected and ventilated in time.

When warehousing, the warehouse temperature should be lowered to 0—-2C in advance. Arrange the position, stacking form and height of goods reasonably according to different packaging containers. The arrangement, direction and gap of goods stacking should be consistent with the air circulation direction in the warehouse. According to the variety, the warehouse should be stacked in different areas and grades. In order to facilitate the air circulation of the cooling stack, the storage density of the effective space shall not exceed 250kg per cubic meter, and the storage capacity of the container loading pallet is allowed to increase by 10%-20%. Apple can be stored at low temperature, and its freezing point is-1~- 1.5℃. Different varieties have different storage temperatures, and the sensitivity of the same producing area to low temperature is also different. For example, the storage temperature of Redjade apple is 0℃, Guoguang can be stored at -2℃, and the storage temperature of Red Marshal apple is-1℃ ~-2℃. The optimum temperature of controlled atmosphere storage should be 0.5℃ ~ 65438 0℃ higher than that of ordinary refrigeration. Apple storage needs 920% ~ 95% relative humidity.