Sweet potato is also called hawthorn, red clam, sweet potato, sweet potato, sweet potato, red clam, sweet potato and so on. Sweet potato is an important food crop in our country. Its yield is high, and its production potential is high. Under better cultivation conditions, it can obtain more than 3,000 kilograms per mu for a large area and a maximum yield of up to 5,000 kilograms per mu; even under conditions of poor soil quality and low fertilization levels, per mu. Can receive more than 1000 kg. To achieve higher yields, it is critical to ensure adequate supply of fertilizer for sweet potatoes. Fertilizer demand characteristics and fertilization of sweet potato: Sweet potato root system developed, strong suction fertilizer, biological yield and economic yield than the general crop, although more resistant, but also more fertilizer. Sweet potato absorbed most of the three elements of fertilizer with potassium, followed by nitrogen and phosphorus again. According to the analysis, 3.5 kg of nitrogen, 1.75 kg of phosphorus, and 5.5 kg of potassium per 1,000 kg of tuber are included. Fertilizer characteristics of sweet potato: Nitrogen fertilizer should be concentrated in the previous application, mainly used as basal fertilizer (mainly organic fertilizer) or top-dressing. In the middle and late period, due to nitrogen deficiency caused by premature failure of stems and leaves, nitrogen fertilizer should also be added. Potash fertilizer needs more at each stage, in addition to a larger proportion in the base fertilizer, but also to do top dressing use, such as potassium fertilizer in the early stage can promote root swelling. Phosphate fertilizers should be blended with organic fertilizers and used as basal fertilizers after application. They can also be applied top-dressing or later-stage root application. In phosphorus-deficient soils, sweet potato application of phosphorus fertilizer has a significant effect on yield increase, and it is necessary to increase phosphorus and potassium fertilizers in high-yield cultivation. Reapply base fertilizer. Sweet potato fertilizer should pay attention to re-basal fertilizer, apply topdressing. The proportion of basal fertilizers and top dressings is somewhat different due to the differences in climate and cultivation conditions between regions. In areas where the sweet potato has a low temperature during the early period of pre-harvest period, the basal fertilizer usually accounts for about 70-80% of the total amount of fertilizer, and it is required to apply fertilizer early. If the sweet potato growth period is a high-temperature and rainy area, the ratio of topdressing is more important than appropriate, and not only the amount of fertilizer is large, but also the frequency of top dressing is more. The basal fertilizer mostly uses organic fertilizer, but in the organic fertilizer also has to match a certain amount of high-level nitrogen fertilizer and phosphorus and potassium fertilizer, in order to fully meet the requirements of sweet potato production on nutrients. Timely top dressing. (1) Promoting Miao Fei: It is an effective measure to ensure that the seedlings are uniform and strong, and to promote early-onset trees and balance the size of the plants. Generally, 5 kg of fast-acting fertilizer is applied per mu. Miaomiao fertilizer to do more than small seedlings, small seedlings are not applied or not. (2) Zhuang Zhu Fei: The top-dressing fertilizer applied before the growth of stems and leaves can promote early tuberization and early ridge closure. Generally 20-30 days after planting, 15 kg of ammonium sulfate is applied per acre. (3) Promoting potato fertilizer: It is generally conducted 60-70 days after planting. Each kilogram of potassium sulfate is applied to the water with 10 kilograms of potassium sulfate. (4) Suitable foliar fertilizers: Usually 40-45 days before harvest, commonly used fertilizers include 2%-3% superphosphate solution, 0.2% potassium dihydrogen phosphate solution, 1% potassium sulfate solution, and spray solution per acre. 100-150 kg.
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