Fresh jujube is called jujube after dehydration and drying. Jujube used for storage should be moderately dry, without damage, pests and diseases, with rosy color and neat size. Jujube has high sugar content and great hygroscopicity and oxidation.
Therefore, the storage temperature and humidity should be reduced as much as possible during storage. Low temperature is the main means to reduce the loss of vitamin C in jujube fruit, and drying is not conducive to the growth and reproduction of microorganisms.
During the storage of jujube, in addition to fermentation deterioration and mildew caused by excessive humidity, pests such as rice borer, wheat moth and thief will also do harm to jujube. Therefore, we should also pay attention to rat prevention.
The southern region is hot and humid, and should be refrigerated in summer and mildew season. Jujube is packed in gunny bags and stored in a warehouse at 5℃. Before leaving the cold storage, it should be moved to a slightly higher temperature for transition and gradually moved out of the warehouse. In order to prevent water vapor from condensing into water droplets on jujube fruit, do not repackage it immediately, but spread it out to dry, and then change bags and package it for shipment after the condensed water droplets disappear.
A small amount of red dates can be stored with rice husk ash. Dry rice husk, with a thickness of about 1 cm, with a layer of red dates, covered with rice husk ash and covered with red dates. This storage method can prevent moisture, sterilize and dry jujube particles, and the effect is good.
Extended data
Jujube is a temperate crop with strong adaptability and wide planting range. Jujube is known as "hardcore crop", which has the characteristics of drought and waterlogging tolerance and is the first choice for developing water-saving forest and fruit industry.
The fruit of jujube is oblate, slightly wider at the top and narrower at the bottom. When ripe, it is dark red/purple brown, and the flesh is white and green. It is ruddy in color, sweet in taste and rich in nutrition, with a sugar content of 74.5%. It can draw bright golden silk, and the edible rate is 96.3%.
The fruit weighs 25 grams, is obovate, with thin skin, deep red color, thick meat, crisp quality, juicy and sweet taste. The soluble solid content of fresh jujube is 37%, the drying rate is 35%, and the sugar content is 7 1%. The peel is slightly bitter and spicy. In the mature period, it is easy to crack the fruit when it rains, and the fruit is heavy and has poor storage and transportation resistance. Strong resistance and wide adaptability, and can be planted in mountainous areas and Pingchuan. Mature in mid-September.
The advantages of this jujube tree are large crown, high yield and long life, with an average yield of more than 50 kg per plant. The average weight of each fruit is 25g, and the maximum weight can reach more than 50g.