Multidimensional ecological preservation technology for sweet potatoes

A cellar sand storage preservation method for sweet potatoes, comprising the following specific operating steps:

• (1) collecting mature tuberous roots, removing damaged, incomplete and diseased sweet potato pieces, and trimming to remove root hair and vines;
• (2) performing BTH (Benzothiadiazole) soaking and cleaning on sweet potatoes to promote formation of a callus on an outer surface of the sweet potatoes, wherein a concentration is 100 mg/L, and soaking time is 3-5 min;
• (3) performing ultrasonication on cleaned sweet potato potatoes under a high temperature of 25-33° C. and high humidity of 90-95% for 2-3 days so as to form a wound healing periderm, wherein ultrasonic power is 100-300 W, and a frequency is 15 kHz;
• (4) uniformly spraying a hydrophobic nano silica solution on sweet potato surfaces, wherein a concentration of the solution is 1-4 wt %;
• and then performing 60Co y ray irradiation on the sweet potatoes at an irradiation dose of 0.1-0.5 kGy;
• (5) uniformly spraying a potassium permanganate solution having a mass fraction of 1-1.5 wt % on each part of a cellar, and performing synergistic ultrasonication during oxidation on the each part of the cellar, wherein ultrasonic power is 100 W, a frequency is 20-25 kHz, and time is 20-30 min;
• (6) alternately laying multiple layers of sweet potatoes and multiple layers of sand when a temperature in the cellar is reduced to 13° C., wherein sand layer thickness is appropriate when the sweet potatoes are not seen;
• covering sandy particles of 5-8 cm thick on a last layer;
• and uniformly mixing microencapsulated preservation particles in the sandy particles, wherein a ratio of the microencapsulated preservation particles accounting for the sandy material is 5-15 wt %;
• (7) building a frame to cover with a membrane tent outside sand storage heaps, wherein the membrane tent is a PE (Poly Ethylene) film of 0.04-0.06 mm thick, and concentrations of O2 and CO2 in the storage environment are respectively maintained in ranges of 7-8% and <10%;
• and
• (8) performing secondary 60Co y ray irradiation at an irradiation dose of 0.1-0.5 kGy on the sweet potatoes after being removed from the sand.