Walnut Storage and Preservation

1. Walnut storage characteristics Walnut is a dried fruit with high nutritional value and is more resistant to storage. Walnut fruit has a total pod, and the total pod contains a hard seed shell (walnut shell). The maturation period of the walnut pods and kernels is inconsistent. Walnut must reach full maturity before it can be harvested. Walnuts are fully mature and characterized by exocarp yellowing from green, cracks appearing at the top, and total pods naturally cracking and peeling easily. Walnut shell is hard, yellowish white or brown. When the whole tree 80% of the walnuts mature, the best harvest period. After storage walnuts are harvested, they must be removed, rinsed, dried, pestproofed, and sterilized. Walnuts often appear moldy, pest, and deteriorating during storage, and management needs to be strengthened. Storage locations must be cool, dry, ventilated, and backlit. Walnuts have a good cold storage effect at a low temperature of around 5 and a relative humidity of 50% to 60%. 2, walnuts stored at room temperature walnuts stored at room temperature can be divided into dry and wet storage (1) dry: the peeled walnuts were placed in a dry and dry place, dried, dried to the diaphragm of a nut is broken, the seed coat and When the kernels are not easily separated and the color of the kernels is the same, they can be stored. Store the dried walnuts in a sack and place in a ventilated, cool, room with no direct high pressure. Prevent the occurrence of rodent damage, mildew, and fever during storage. (2) Wetland: Dig a ditch with a depth of 1 meter, a width of 1 to 1.5 meters, and a long storage period, depending on the terrain, dryness, and good drainage. The bottom of the ditch is covered with a layer of clean wet sand with a thickness of about 10 cm. The humidity of the sand is pinched into a concordance but not water. A layer of walnut is then layered on the sand, and the trench walls and walnuts are filled with wet sand, leaving no gaps. About 20 centimeters from the mouth of the ditch, cover wet sand and the ground, the soil is ridge-shaped, its span is greater than the width of the ditch. Open the ditch around the ditch to prevent the rain from infiltrating too much, causing the humidity to be too high and easy to make the walnut mildew. When the length of the ditch is more than 2 meters, a tightly-knotted straw should be used every 2 meters for the ventilation hole when storing the walnuts, and the height of the grass should be exposed to the "roof" degree. The thickness of soil on the roof of the roof varies with the weather, and it is necessary to grow thicker in cold areas in winter. 3, using plastic film account or bag storage walnut will be timely harvested and processed walnuts after bagging into a stack, stored in a low temperature place covered with plastic film big account, the carbon dioxide gas into the account (nitrogen is also Can)) to reduce the oxygen concentration. The content of carbon dioxide in the early stage of storage can be quite high, reaching 50%. After about 20%, the oxygen is about 2%, which can prevent the growth of lipids and oxidative degradation of the seed, avoid the loss of flavor and quality, and prevent the fruit from becoming moldy. And the role of insects. The use of plastic account sealed storage should be carried out in low temperature, dry season in order to maintain the low humidity inside the account. In the south, in the late autumn and early winter, the temperature is still high, and the air humidity is also high. Walnuts can be collected after storage. Pay attention to add moisture absorbent and reduce temperature. It is best to store large accounts in a ventilated or cold store. It is packed in polyethylene film bags, sealed and stored at 0-1°C. The storage effect is quite good.

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