How long is the growth cycle of sweet potato? What problems should we pay attention to when planting sweet potatoes?

We planted sweet potatoes in sandy soil with acid and alkali land resources, pre-planted seedlings around Tomb-Sweeping Day gas, ploughed deeply at seedling stage, ridged with sufficient organic fertilizer, dug holes, then applied NPK compound fertilizer 10g-20g to each hole, planted sweet potato seeds well, and paid attention to putting the bud tips upward, not flattening them, covering them with fine sand, and pouring farmyard manure. After two weeks of sweet potato germination, 25 kilograms of farm manure was added with 25 kilograms of water, 250 grams of urea solution was added, and seedling fertilizer was poured.

The agricultural film should be removed, so that the sweet potato seedlings can grow and slowly integrate into the ecological environment temperature. The seedling period of sweet potato is about one month, and the sweet potato seedlings of about 30 days are likely to be transplanted into the field. After continuous cropping of sweet potato for three years, diseases increased, underground pests became more serious, potato blocks were covered with insect holes, easy to crack and rot, low yield, poor quality, and labor cost and drug cost increased. It is best to choose underground crops such as sweet potatoes, potatoes and peanuts that have not been planted for three years, and it is best to use wheat and leguminous crops as stubble.

Sweet potato continuous cropping has high yield and the best quality. Now all sweet potato varieties are short vines, and most of them don't have to turn over the ground. Overturning vines will damage leaves and stems, resulting in limited sweet potato production. When sweet potatoes grow, there is abundant precipitation, which is very easy to grow and develop, and there are few tubers. When the sweet potato vine grows to one meter, it can be controlled by spraying mepiquat chloride. Plant two kinds of sweet potatoes in the morning and evening. One is to raise seedlings with yam in spring, dig a few drops of water and then ridge them. The sweet potato planted at this time is called old medicine, which is characterized by high yield, high starch content and long growth period.

Generally, it is obtained after the Millennium Festival, or after the wheat harvest, the branches are cut from the yam seedlings planted in spring and planted in the same way. It's called rattan medicine. Because of its short growth period, low yield and high water content, this sweet potato is very easy to store and overwinter. It can be used as the mother seedling of yam next spring. It is a traditional sweet potato cultivation, but now it is different because of the plastic film mulching technology.