Sweet potato, also known as sweet potato, has the characteristics of high yield, strong regenerative capacity, and tolerance to barrenness. Sweet potato is a good potassium crop. Among the three elements of fertilizer, nitrogen, phosphorus, and potassium, potassium needs to be the largest, followed by nitrogen and phosphorus, and the ratio of nitrogen, phosphorus, and potassium in roots is 2:1:3. This is because potassium can extend the functional period of leaves, promote photosynthesis and amylase activity, and accelerate the synthesis and operation of starch. At the same time, potassium can strengthen the activities of the root formation layer, which is conducive to the formation and expansion of tuberous roots. If potassium is lacking, the sweet potato will show internodes in the early stage of growth, and the petiole will become shorter and the leaves will become smaller. In the later period, the potassium deficiency in the old leaves and veins will be severely lacking in green, and the gradual necrosis will have a great impact on the yield. Therefore, the scientific application of potash fertilizer is an important measure for the high yield and stable production of sweet potato. Its main application methods are:

First, the end. Basal fertilizer application of potash fertilizer is the basis of high yield. The base fertilizer should be dominated by high-quality organic fertilizers. Sandy soils have poor water retention and fertilizer retention capabilities. Semi-mature organic fertilizers should be used as base fertilizers; clay soils should be applied to mature organic fertilizers; - 150kg, or 3500-5000kg of high-quality farmyard fertilizer containing more potassium to be applied in layers. Pay attention to the application of plant ash, do not mix with ammonium nitrogen or human waste, so as not to cause loss of nitrogen volatilization. In addition, sweet potato is a bogey crop and potassium chloride should not be used.

Second, soaking vines. Soaking potassium with potato vines can increase survival and promote early-onset hair growth. The specific method is: 0.5 kg of potassium sulfate and 25 kg of water are mixed to make a concentration of 2%. The cut sweet potato vine seedlings are soaked in the potassium solution, and the parietal lobe should be exposed to the water surface. After soaking for 1 hour, it can be planted by taking it out and drying it.

Third, topdressing. About 40 days after planting, 667 square meters of potassium sulfate 10 kg, 7-10 cm at the base of the potato seedlings open a deep hole, applied after the cover soil, in order to promote the formation and expansion of roots. When the cane grows to about 1 meter, in the morning without wind and dew, 667 square meters is about 50 kg of plant ash, which is directly applied on the leaf surface, which can prevent the potato vines from becoming long and promote the expansion of the tubers. In the expansion period of the potato block, if the soil is moist, there is more rain, and when the vines and leaves turn yellow, more ash can be applied.

Fourth, spray. In the late growth stage of sweet potato, spraying potassium fertilizer solution on leaves has a significant effect on yield increase. Usually 40-50 days before harvest, with 1% potassium sulfate solution or 0.2% potassium dihydrogen phosphate solution or 5% ash leaching solution (5 kg of grass ash plus 100 kg of water soaked for 24 hours after filtration), every 7 days or so Spray 1 time, spraying a total of 2-3 times, spraying 667 square meters of 75-100 kg of potassium fertilizer solution. It is generally advisable to spray in the evening to facilitate the absorption of the leaves and increase the fertilizer efficiency.

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