Sodium chloride (salt) preservation: Sort the freshly picked oyster mushrooms, phoenix tail mushrooms, etc. and soak them in 0.6% salt water for about 10 minutes, drain them and put them into plastic bags for storage. Keep fresh for 5 to 8 days. Sodium metabisulfite preservation: Spread the newly harvested oyster mushrooms on a clean cement floor, spray 0.15% sodium metabisulfite aqueous solution onto the mushroom bodies, and turn the mushroom bodies while spraying to ensure even spraying. After spraying, put it into a plastic bag, seal it immediately and store it in a cool place. It can stay fresh for 8 to 10 days at 10℃~25℃. When eating, rinse with clean water. Rice soup film preservation: Use dilute rice soup when making rice, add 1% soda ash or 5% baking soda, and cool to room temperature. Soak the picked fresh mushrooms in rice soup lye, take them out after 5 minutes, and store them in a cool and dry place. At this time, a thin film of rice soup is formed on the surface of the mushroom, which can isolate the air and keep it fresh for 3 days. Ascorbic acid preservation: After harvesting enoki mushrooms, shiitake mushrooms, straw mushrooms, etc., spray 0.1% ascorbic acid solution on the fresh mushrooms and put them into non-iron containers. They can be kept fresh for 3 to 5 days, and their freshness and color will not change basically. Sodium chloride and calcium chloride mixed solution to preserve freshness: Use 0.2% sodium chloride and 0.1% calcium chloride to make a mixed soaking solution. Soak the freshly harvested mushrooms in the mixed liquid, cover them with a bamboo grate and add a heavy object, so that the mushroom bodies are immersed below the liquid surface for 30 minutes. They can be kept fresh for about 5 days at 15℃~25℃, and at 5℃~ It can be kept fresh for more than 10 days at 10℃. Ascorbic acid and citric acid mixture for preservation: Prepare a mixed preservative solution of 0.05% ascorbic acid and 0.02% citric acid, soak the fresh mushrooms in the preservative solution for 10 to 20 minutes, remove and drain, and seal in a plastic bag. Bijiu (B9) preservation Bijiu is a plant growth retardant. Soak fresh mushrooms in 0.1% bijiu aqueous solution for 10 minutes, take them out, drain them, seal them in bags, and keep them fresh at 5°C to 25°C for more than 15 days. Suitable for the preservation of mushrooms, shiitake mushrooms, oyster mushrooms, enoki mushrooms and other fungi. Medical stone preservation: Put the fresh straw mushrooms into a plastic box, submerge the mushroom body with medical stone water, and store it at a low temperature below 0°C to keep it fresh for up to 70 days. Moreover, the amino acid content is not much different from that of fresh mushrooms, and the color and taste are better. Hope my answer is helpful to you!