Hoarding technology of sweet potato

1. Harvest at the right time and select seed potatoes. The harvest of sweet potatoes in our region is usually in late October, that is, around Frosts Descent. The harvest begins when the local temperature reaches 15 ℃ and ends at 2 ℃. Choose sunny morning harvest, easy to wet, when entering the cellar, choose disease-free, injured, frozen, flooded potato into the cellar.

2. Pit treatment. Whether it is a new cellar or an old cellar, it will be sterilized and disinfected. The cellar wall can be sprayed with lime water or carbendazim 500 times solution, or sealed fumigation can be carried out with 1% copper sulfate solution or 50 times formaldehyde solution.

3. Chemical treatment of fresh potato with 50% carbendazim 500 times solution or sweet potato antistaling agent to control sweet potato black spot, the control effect can reach more than 95%. The method is to soak the selected seed potatoes in the prepared solution for 10-15 minutes, remove and drain the potion and enter the cellar.

4. Control the pit temperature. Fresh potatoes that have just entered the cellar should close the cellar to increase temperature to promote wound healing and kill some bacteria because they are easy to damage the epidermis in the process of transportation and entry. When the cellar is closed for about 7 days, the pit door should be opened to cool and dissipate the temperature, so that the pit temperature should be stable at 11-14 ℃ and the relative humidity should be controlled above 80%.

After the Beginning of Winter, the temperature turns cold, and the management should give priority to heat preservation and cold prevention. First of all, the storage should not be too full, accounting for about 3 to 4 of the total storage in the cellar, and then thickened wall soil and potato piles covered with rice straw and wheat straw. Ensure that the temperature in the cellar is in the range of 11-14 ℃.

After the Beginning of Spring, the temperature became warmer, the management should give priority to ventilation, open the pit door at noon on a windless and sunny day to ventilate, strictly prevent the spread of diseases caused by the rise of pit temperature, resulting in sweet potato rot.

Through the above technical treatment, the seed potato can survive the winter safely, and the intact rate is more than 97%.