Walnut storage method
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1. Ripening and Harvesting of Walnut: In 80% of the walnut trees, the peels turn from green to yellow, and cracks appear at the top. The total cracks naturally crack and peel easily. The seed kernels are hardened, the young embryos mature, and the core and shell are hard and yellowish-white. Harvested when brown. Second, the storage of walnuts before processing: (1) off the total volume. The harvested walnuts are taken off as soon as possible and dried. For walnuts that have not yet cracked, they need to be dislodged after 5-7 days of accumulation. (2) rinse. Soak the walnuts with 60-80 times bleach solution for 8-10 minutes. Remove when the shell surface is blue-red and rinse with clean water. (3) Drying. The walnuts are sun dried to the kernels, and the shells are changed from white to golden yellow. The membrane is easily broken and the average water content is 6-8%. (4) Anti-insect sterilization. For every 100 cubic meters of volume, 1.5 kg of carbon disulfide or 1.7 kg of methyl bromide is used for fumigation for 24 hours. Third, the appropriate environmental conditions for walnut storage: temperature 5 °C, air relative humidity 50-60%. Fourth, storage and preservation technology: 1, wet reservoir method. In the high dry terrain, well-drained, back-shade shelter, dig deep 1 meter, width 1-1.5 meters, the length of the ditch with storage. The bottom of the ditch is covered with a layer of clean wet sand with a thickness of 10 cm. The humidity of the sand is crushed into a group with no water. Then spread a layer of walnut sand, filled with wet sand between the trench wall and the walnut. Spread to a depth of 20 cm from the trench, cover with wet sand and the ground level. The soil on the sand is ridge-shaped and its span is greater than the width of the ditch. Open ditch around the ditch. When the length of the ditch exceeds 2 meters, a tightly-knotted straw shall be used every 2 meters for venting when storing walnuts, and the height of the grass shall be exposed to the degree of "roof". In winter, the soil on the roof of the cold area is thicker. 2, dry method. The peeled walnuts were placed in a dry and ventilated place until the diaphragm of the nuts was broken. The seed coats and seed kernels were not easily separated, and the seed kernels were stored at the same time inside and outside. Place the walnuts in a sack and place in a ventilated, cool room. During storage to prevent rat damage, mildew and fever. 3, plastic film packaging storage method. After the walnuts are bagged, they are piled into a bowl, covered with plastic film at 0-1°C, and filled with carbon dioxide or nitrogen. At the beginning of storage, the inflation concentration should reach 50%. After that, the carbon dioxide should be kept at 20% and the oxygen should be kept at 2%. This will not only prevent the fat of the kernels from oxidizing and deteriorating, but also prevent the moulds and worms of the walnuts.