Grape storage characteristics and storage conditions

Grapes have a long history of cultivation in China. In recent years, there have been major developments in various parts of the north. Grape fruit is soft and juicy, not only delicious and delicious, but also rich in nutrients. In addition to serving as fresh fruit, it is mainly used in winemaking and can also be made into processed products such as grape juice and raisins. There is a lot of experience in storing grapes in the grape growing area. Both can obtain satisfactory results.
Storage characteristics and storage conditions One of the keys to the storage quality of grapes is the variety characteristics. There are many grape varieties in China, and many varieties are more resistant to storage. For example, Longan, Black Han, New Rose, White Lotus, Italy, Rose, etc. In general, late-maturing varieties are more resistant to storage than early-maturing varieties. Some varieties are susceptible to fruit shedding or fruit stem breakage during storage and transportation and are not suitable for long-term storage. Some white grape varieties are susceptible to bruising and brown markings. Special care must be taken during handling. Avoid scratches.
As a storage grape, irrigation should be stopped about one week before harvest to increase the sugar content for storage. If a lot of water or rainy weather occurs before harvesting, the grapes will easily rot during storage.
Because the grape has no ripening effect, the harvesting period should be delayed as long as the climate and production conditions permit. The higher the grape harvested, the higher the sugar content, the thicker the peel, the toughness, the good color and the storage resistance. . In some places, grapes are prepared for storage until most leaves of the plants fall off and remain on the plants, allowing them enough time to accumulate sugar. At the same time, because of the late harvest, the post-harvest temperature is very low, which is conducive to storage. The grapes used for storage should be harvested in the early morning or late evening when the weather is fine and the temperature is relatively low. Carefully cut the ears, remove the fruit and insects, and put them in baskets or boxes.
Grapes are prone to dry stems, wrinkled skin, threshing and rot during storage or transportation, which are related to the characteristics of the varieties, and are also related to storage conditions and management.
The suitable storage temperature for grapes is -1 to 0°C and relative humidity is about 90%. The freezing point of grape fruit differs depending on the sugar content. The higher the sugar content, the lower the freezing point, which is generally around -3°C. Most varieties of grapes do not freeze at -2°C, but fruit and stems with low soluble solids will freeze. High humidity conditions can reduce the loss of fruit and make it fresh. Dehydration of grapes causes quality to decline and appearance to deteriorate. Sulfur dioxide fumigation can reduce decay caused by pathogenic microorganisms.

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