Sweet potatoes are vegetatively propagated vegetative bodies, and there are no obvious maturity standards and harvesting periods. However, as soon as the harvest is harvested, it affects the 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, it will often be affected by low-temperature chilling, and it will become intolerant to storage and the rate of cuts will decrease. Therefore, sweet potatoes must be harvested in a timely manner.
The optimal harvest of sweet potatoes should be based on climatic conditions, safe storage time, and arrangement of crops under the crop. The ground temperature is around 18°C. The sweet potato weight increases little. When the ground temperature is around 15°C, the sweet potato stops expanding. When the ground temperature is below 9°C for a long time, cold injury will occur. Therefore, generally at the ground temperature of 18 °C began to planing, finishing before the frost. The dried sweet potatoes or thawing winter wheat are usually harvested before cold dew; the summer sweet potatoes left for planting are harvested before the frost falls; the sweet potatoes for storage are harvested later, but must be harvested before the frost.
The soil is too dry or too wet, which is unfavorable for the harvest of sweet potatoes. When it is too dry, the soil moisture content decreases, the ground temperature changes greatly, the sweet potato is vulnerable to cold damage, and it is not easy to shave. Too moist, too much soil moisture, sweet potatoes is not only difficult to plan, but also large water content, after storage impatience. When the soil is too wet, the sweet potato stalks should be cut off and dried for a few days until the soil is slightly dry.
The summer sweet potatoes left for planting should be harvested on a sunny day, 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, the sweet potato can be picked in the ground and the diseased, remnant and water-smelling sweet potatoes can be removed and stored separately for different uses and varieties. From harvesting to storage, the number of overturns should be reduced as much as possible, and care must be taken to gently, lightly, lightly, and lightly to avoid bumping the skin.
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