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. The ratio of nitrogen, phosphorus and potassium in sweet potato tuber is 2:1:3. Therefore, if sweet potato lacks potassium in the early stage of growth, internodes will appear, petioles will become shorter, and the leaves will become smaller. In the later period, potassium deficiency in the old leaves and veins will be severely lacking in green, and they will gradually come off and fall off, which 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 potatoes. The main application techniques are:
Base fertilizer
Basal fertilizer application of potassium fertilizer is the basis for sweet potato to obtain high yield. Therefore, high-quality organic fertilizers should be the mainstay. Because sandy soils have poor water retention and fertility, semi-mature organic fertilizers should be used as base fertilizers, and clay soils should be made of organic fertilizers that are to be decomposed. Combine the use of turfgrass with 100-150 kilograms of plant ash or 3,500-5,000 kilograms of high-quality farmyard manure containing potassium. In the application of plant ash, be careful not to mix with ammonium nitrogen fertilizer or human waste, so as not to cause loss of nitrogen volatilization. In addition, sweet potatoes are chlorine crops and potassium chloride cannot be used.
Potato vine extract potassium
Potassium cane soaking potassium can increase survival, and plants promote early-onset hair growth. The specific approach is: 0.5 kg of potassium sulfate water, add 25 kg of water and mix well to make a concentration of 2%, and cut the sweet potato vine seedlings in the potassium solution soaking, the top leaves should be exposed to the water surface. After soaking for 1 hour, it can be planted by taking it out and drying it.
Potato seedlings topdressing potassium
About 40 days after planting, 10 kg of potassium sulphate was used in the mu, and a deep hole was applied at the base of the potato seedling at a depth of 7-10 cm, and soil was applied after the application to promote the formation and expansion of tuberous roots. When the cane grows to about 1 meter, in the morning with no wind and dew, mu is about 50 kilograms 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.
Foliar Spraying Potassium
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, use 1% potassium sulfate solution or 0.2% potassium dihydrogen phosphate solution or 5% plant ash leaching solution (5 kg of turfgrass plus 100 kg of water soaked for 24 hours and filtered to remove slag) every 7 days or so Spray 1 time, spray 2-3 times, spraying 75-100 kg of potassium fertilizer per acre. 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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