1. Temperature requirements-1℃ ~ 0℃;

2. Humidity requirement is 85% ~ 95%;

3. 3% ~ 5% of oxygen and 3% ~ 5% of carbon dioxide are the indicators of modified atmosphere;

4. Fresh plastic bags

5. The storage period is 3 to 7 months.

Second, the storage technology and management measures

There are many storage methods of hawthorn, and creating suitable temperature, humidity and gas conditions in the storage environment of hawthorn is the technical key to prolong the storage life. The previous fresh-keeping methods of hawthorn in various places are roughly as follows:

(1) Gully storage: This method is often used in Shandong, Hebei and other places. First of all, we should choose a place with flat and dry terrain, leeward and sunny, difficult to accumulate water and convenient transportation to dig storage ditches. The direction of the ditch should be north and south. Generally, the upper width of the ditch is 100 cm ~120 cm, the depth of the ditch is 50 cm ~ 60 cm, and the lower width is 70 cm ~ 80 cm. The length of the ditch depends on the storage capacity and topography. The bottom of the ditch should be flat. Pave fine wet sand with a thickness of10cm ~15cm, spread it out and compact it. Then pile the selected hawthorn on it, each layer is 40 cm ~ 50 cm thick, and the top of the pile is roof-shaped, and then gradually sinks into a flat shape. Before storage, cover the grass curtain or reed mat during the day and uncover the heat at night. In the later stage, it is mainly anti-freezing. When the local frost is more than two fingers deep, the top should be covered with hay, leaves and other cold protection, and then gradually add soil with the temperature dropping, with a thickness of 30 cm to 40 cm. A small drainage ditch should be dug on both sides of the ditch.

In some areas, hawthorn is hidden in ditch sand, and its specifications are the same as before. It's just that the effect is different, that is, put a layer of fruit and cover it with a layer of wet fine sand until the top. Leaves are placed on the four walls and top of the ditch to separate the fruit from the soil. Other methods are the same as before.

(2) Burying method: also called pit hiding method. Dig a pit in the sun, with a depth of about 100 cm and a diameter of 70 cm, and lay a layer of 15 cm ~ 20 cm on the bottom of the pit, then pile the selected fruits into the pit with a height of 50 cm ~ 60 cm, cover it with 15 cm ~ 20 cm, and finally cover it with a mound. Burying starts in the middle and late of every year 10. (3) Pit storage method: This is the most common method used in northern China. Choose places with high and dry terrain, low underground water level, air circulation and solid soil to dig pits, and the specifications of pits vary. It is best to enter the cellar in the middle and late months of 1 1 when the weather turns cold, and the packaging container can be baskets, baskets or boxes. When palletizing, there are cushions at the bottom and between layers, and pay attention to leaving certain pores to facilitate ventilation.

(4) Cylinder storage method: this legal system is used for a small amount of storage in the family. First, wash the jar thoroughly, put it in a cool room, put a earthen pot at the bottom of the jar, and put 4 ~ 5 stalks in the jar for ventilation. Then, put the selected hawthorn fruit into the jar until it is 15 cm away from the edge of the jar, and then put a layer of cereal grass or leaves or vegetable leaves on it. When the weather turns cold (about 1 1 month), seal the cylinder mouth with kraft paper or paste.

Although the above methods are simple and convenient, the preservation effect is not good, and the loss of decay is often great, and the quality of preserved hawthorn is obviously not as good as before, and the taste is much lower.

Now, fruit farmers can use Baileyuan's fresh-keeping plastic bags for storage, instead of burying them in the past, they can use fresh-keeping plastic bags for storage in ventilation and cold storage. This method can be used for mass storage, making full use of natural cold sources or adopting mechanical refrigeration to create suitable storage conditions. At present, hawthorn dealers use Baileyuan's fresh-keeping bag, which has obvious fresh-keeping effect and unchanged taste.

It should be noted that ventilation storage should pay attention to reducing the temperature as soon as possible in the early stage; Cold storage should maintain a stable and suitable storage temperature to reduce temperature fluctuations. At the same time, it is necessary to strengthen ventilation management and improve the humidity of storage environment.