Watermelon Storage and Preservation Method 1. Harvest and Postharvest Treatment of Watermelon 1. Variety choice: Choose melon meat dense, high sugar content, thick and tough husk varieties. 2. Maturity: It is better to use about eight ripeness when harvesting. Raw melons or over-matured melons are not conducive to storage. 3. Picking time: Stop irrigation for 7-10 days before picking. Picking time should be in the early morning or early afternoon. Avoid harvesting when the temperature is high under the hot sun. 4. Picking method: picking should take 2-3 cm of the stalk, retain a section of vines and 3-4 leaves. In the process of picking and transporting, it should be handled gently to avoid bumps, vibrations and squeezing so as not to cause internal injuries that are difficult to detect on the surface. Such internal injuries are extremely prone to corruption during storage. Therefore, it is better to be able to store in origin and avoid long-distance transportation. 5. Drug treatment Immerse the ready-to-store watermelon in 15% saline for 30 minutes, remove it, and air dry it. Treated watermelon, per kg of watermelon with 0.1-0.2 ml of Kemyme to cotton ball or absorbent paper adsorption, scattered around the watermelon, sealed with a plastic film fumigation for 24 hours, you can mold anti-corrosion. In the case of meeting other storage conditions, it can be stored for about 4 months. Second, the appropriate conditions for storage Temperature: The suitable temperature for short-term storage is 7-10 °C, and the suitable temperature for long-term storage is 12-14 °C. When the temperature is lower than 7°C, it is prone to cold damage. The symptoms of chilling injury are: irregular and shallow depressions on the surface of the fruit; when the chilling injury is severe, the color of the pulp is light, the fibers increase, and the flavor deteriorates. In order to prevent the occurrence of chilling injury, it can be adopted: 1 The minimum storage temperature can not be lower than 7°C; 2 The pre-storage temperature (26°C) is stored for 4-5 days. 2. Humidity: The appropriate relative humidity is 75%-80%. Third, the storage method Cold storage: Put the treated watermelon into a plastic bag, and put some crushed foam soaked with saturated potassium permanganate to absorb the ripening effect of ethylene produced by the watermelon itself. Then sealed Zha storage. Or pile three layers of watermelon, pay attention to the placement of the same position with the field growth, and at the same time in the watermelon layer to dispose of some processed broken foam, and then covered with plastic film, but not sealed. The refrigerating temperature is about 12°C and the relative humidity is about 75%. This method can be stored for about 2 months. 2. Sand trap: Choose a cool, ventilated house for storage. Spread 7-10 cm thick sand on the ground, spray it with 1% potassium permanganate or 150-fold formalin solution, and then vent it. Place the treated watermelons one by one on the sandy surface, leaving the watermelon on the side of the original sand, not squeezed. After the row is completed, cover the sand to the 1/3-2/3 of the stalk, expose the green leaves to the sand, spray the leaves with 0.1% potassium dihydrogen phosphate solution and 0.5% sucrose solution. Primary potassium dihydrogen phosphate and primary sugar solution. This method can be stored for about 50 days. Pay attention to keeping the sand moist. 3. Stacking or racking: spread 10 cm thick wet sand on the ground, store three layers of watermelon or put it on shelves for storage. In the process of storage, watermelon should pay attention to the following points: (1) The location of the watermelon should be the same as that of the field, and leave the cold storage wall. (2) Regular inspections have found that deteriorated watermelons should be picked up in time to prevent infestation of other watermelons. (3) If the humidity is too high, the watermelon should be turned and ventilated and drained. (4) Strictly prevent rat damage.
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