Harvesting is one of the important aspects of the sweet potato production process. The sooner or later the harvest time and the level of technology, not only directly affect the yield and quality of sweet potato, but also have a great impact on the processing and storage of potato chips, and then affect the economic benefits of potato farmers. Harvest time: Sweet potato does not have a significant period of maturity. As long as the conditions are suitable, the longer the growth period, the higher the yield. If the harvest is too early, people will artificially shorten the growth period of sweet potatoes and reduce the yield. However, if the harvest is too late, if the temperature below 9°C is encountered, it will cause cold damage or frost damage to the tuber, which is not conducive to the safe storage of the tuber and also affects the consumption. Harvesting sooner or later will also affect the dry yield and starch content of the tubers. Scientifically determine the harvest time of sweet potatoes based on three aspects: First, crop rotation. For winter crop rotation areas such as sweet potato and wheat, we must take into account the up and down cornice arrangement. The second is the temperature at that time. Temperature is the main basis for determining the appropriate period for the harvest of sweet potatoes. When the average temperature dropped to about 15°C on the day, the harvest began and when the temperature dropped to 12°C, the harvest was completed. The third is the use of sweet potatoes. Seed harvesting and storage harvesting must be completed before the frost is finished. Drying or processing the starch can be delayed for a few days, but it is better to avoid freezing. Harvesting Techniques: Harvesting is done manually and mechanically. No matter what kind of harvesting methods, we must strictly control the harvesting techniques to improve the harvest quality. First, try to reduce the leakage, and the other is to prevent damage. The best choice for seed potatoes or storage of potatoes harvested in the sunny morning, drying in the ground at noon, after the selection of the afternoon of the same day shipped back to storage. In addition, in the process of harvesting and transporting, it is necessary to do “four light†(light, light, light, and light) as far as possible so as not to damage the potato skin.
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