First, plant sweet potatoes horizontally and onions vertically.

The meaning of this sentence is easy to understand, which means that sweet potato seedlings should not be planted vertically like green onions, but horizontally, so that sweet potato yield is high.

Because each stem node of sweet potato can take root and produce sweet potato, the seedlings planted horizontally will be significantly longer than those planted vertically or obliquely, so the number of seedlings planted horizontally can be significantly increased and the yield of sweet potato will be higher.

When the sweet potato seedlings are planted horizontally, we cut the sweet potato seedlings into 20 to 25 cm long, and it is best to have 4 to 5 buried stem nodes (there are too many buried stem nodes, and there are more tubers, but the potato pieces will be smaller; Buried stem nodes are too few, potato pieces are large, but the number of tubers is small), the buried depth is controlled at 5 to 7 cm, and the top three leaves are spread out of the ground.

Sweet potato seedlings can be planted vertically, obliquely and horizontally. Using "bottom transplanting method" for sweet potato seedlings can not only make sweet potatoes grow much longer, but also make them grow bigger. The "bottom transplanting method" is to put sweet potato seedlings into the soil in a U shape. Compared with the horizontal planting of sweet potato seedlings, the drought resistance of sweet potato seedlings will be strengthened. The "bottom transplanting method" can make the sweet potato layer by layer, the root tuber of sweet potato will present three-dimensional distribution, and the yield per unit area of sweet potato will be greatly improved. The length of sweet potato seedlings cultivated by "bottom transplanting method" is generally about 25 to 30 cm.

Second, Gaoling sweet potato

Sweet potato is a drought-tolerant and waterlogging-tolerant plant. High soil moisture is not only easy to cause white growth of plants (sweet potato plants will grow white and small potato pieces), but also easy to cause root rot of sweet potatoes. Therefore, sweet potato is easy to be cultivated on high ridges.

In addition, planting sweet potatoes in high ridges can also increase the temperature difference between day and night (soil temperature rises quickly during the day and drops quickly at night). The greater the temperature difference between day and night, the more conducive to the accumulation of organic matter, which is very helpful to improve the yield and quality of sweet potato.

Third, turn vines into vines.

Many "adventitious roots" will grow during the growth of sweet potato vines. These adventitious roots will absorb water and nutrients from the soil to grow stems and leaves, which will easily lead to the flourishing growth of sweet potato vines. Destroying the adventitious roots of sweet potato is beneficial to the centralized supply of nutrients to the main roots and the full expansion of sweet potato tubers.

In order to destroy the adventitious roots on the sweet potato vine, many people will "turn over the vine" for the sweet potato, but turning over the vine will easily lead to the turning over of the leaves of the sweet potato, which is not conducive to the photosynthesis of the plant. After each vine rotation, it takes 4 to 5 days for plants to recover. If the vine is turned over for 2 ~ 3 times, it is equivalent to keeping the sweet potato in an intermittent state of 10 ~ 15 days, and the expansion of the underground tuber of sweet potato will inevitably be affected.

Therefore, we can turn "turning vines" into "lifting vines". When lifting vines, we only need to gently lift them before putting them down, which is not easy to damage the stems and leaves of sweet potatoes, and the operation is simple, which is more conducive to high yield of sweet potatoes.

Fourth, avoid partial application of nitrogen fertilizer and "chlorine" fertilizer.

Sweet potato is a potassium-loving crop. Potassium can promote the synthesis and transportation of photosynthetic products and the expansion of potato pieces. Therefore, potassium fertilizer should be the main fertilizer for sweet potato, and nitrogen fertilizer should not be applied. Partial application of nitrogen fertilizer will lead to vigorous plant growth and seriously reduce the yield of sweet potato. As the old saying goes, "a handful of sweet potatoes is a handful of ash, and sweet potatoes form a pile." Plant ash can not only loosen soil, but also is rich in potassium, so we can use plant ash as base fertilizer. When cracks appear in the soil, we can irrigate the roots with plant ash leaching solution, which can promote the swelling of potato pieces.

In addition, fertilizers containing "chlorine" should not be applied to sweet potatoes. Chlorine will inhibit the synthesis and transportation of starch, and the high concentration of chloride ion in soil will seriously reduce the yield and taste of sweet potato, so we can apply potassium sulfate instead of potassium chloride to sweet potato.

Five, cold dew early, beginning of winter late, then the first frost potato harvest.

Sweet potato is a crop with a long growth cycle. If you dig too early and the potato pieces are not fully developed, the yield of sweet potato will be lower. If you dig too late, sweet potatoes may get frostbite.

As the saying goes, "The cold dew is early, beginning of winter is late, and the first frost is harvesting potatoes at that time", which means that the solar term of the first frost is the best time to harvest sweet potatoes. Sweet potatoes are afraid of cold and like warmth. When the temperature is below 8℃, plants will be dried by frost. However, the daily average temperature in most parts of China is stable at 10 ~ 15℃ in the first frost solar terms. At this time, digging sweet potatoes can ensure that the potato pieces are fully expanded. If the sweet potato pieces were dug during the solar term in beginning of winter, the potato pieces in the ground would easily freeze.