Sweet potato is a vegetatively propagated vegetative body. There is no obvious maturity standard and harvesting period, but harvesting sooner or later will have an impact on sweet potato yield, seed storage, storage, processing and utilization, and crop rotation. If the harvest is too early, the yield of sweet potatoes will be significantly reduced. If the harvest is too late, sweet potatoes are often affected by low-temperature chilling, and they are intolerant of storage and the rate of cuts decreases.
The harvesting period of sweet potatoes should be determined according to the climatic conditions, safe storage time and arrangement of the crop. Ground temperature around 18 °C, sweet potato weight increased little; ground temperature at about 15 °C, sweet potato stop expanding; ground temperature long time below 9 °C, it will cause cold damage. Therefore, it is common to begin harvesting sweet potatoes at a ground temperature of 18°C ​​and harvesting them before drying. The spring sweet potatoes used for stem drying or winter wheat crops are generally harvested before cold dew; the summer sweet potatoes left for seeding are harvested before the frost falls; the sweet potatoes stored for consumption are harvested later, but must be harvested before the frost.
Dry or wet soil is not good for sweet potato harvest. When it is too dry, the soil moisture content decreases, and the ground temperature changes greatly. Sweet potato is vulnerable to cold damage and it is not easy to shave. Too moist, too much soil moisture, sweet potato is not only difficult to plan, but also a large amount of water, immature storage after harvest. When the soil is too wet, the sweet potato vines should be cut off and dried for a few days.
The summer sweet potatoes left for planting should be harvested in the sunny morning, sun dried in the field, and entered the pit in the afternoon of the same day. Do not spend the night in the ground to avoid cold damage.
After the sweet potatoes are harvested, they can be selected in the field to remove the diseased, remnant and water-logged potato pieces and store them according to different uses and varieties. From harvesting to storage, the number of overturns should be reduced as much as possible, and care should be taken with light, light, light, and light transport to avoid bumping the potatoes.
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