As one of the important food crops in China, the improvement of yield and quality of sweet potato is of great significance for agricultural production. Reasonable fertilization, especially the choice of base fertilizer, plays a vital role in the growth and development of sweet potato. This article will ** the appropriate choice of sweet potato base fertilizer, in order to provide strong support for the high yield and quality of sweet potatoes.
1. The importance of sweet potato base fertilizer.
Bottom fertilizer is a fertilizer that is applied to the soil before sowing or transplanting, and is intended to provide nutrients throughout the growing season of the crop. For sweet potatoes, the role of base fertilizer is particularly prominent. On the one hand, sweet potatoes are root crops with high requirements for soil nutrients. Sweet potatoes, on the other hand, have a longer growing season and require consistent nutrients**. Therefore, it is of great significance to choose the appropriate base fertilizer to promote the growth of sweet potatoes and improve the yield and quality.
Second, the appropriate choice of sweet potato base fertilizer.
Organic fertilizer: Organic fertilizer is rich in a variety of nutrients, such as nitrogen, phosphorus, potassium, etc., and the fertilizer effect is long-lasting, which helps to improve soil structure and soil fertility. For sweet potatoes, organic fertilizer is an ideal base fertilizer choice. For example, livestock and poultry manure, manure, etc., are applied to the soil after being fully decomposed, which can provide rich nutrients for sweet potatoes.
Compound fertilizer: Compound fertilizer is a fertilizer prepared according to the characteristics of crop fertilizer, which is rich in nutrients and reasonable in proportion. According to the fertilizer demand characteristics of sweet potato, nitrogen, phosphorus and potassium compound fertilizer can be selected as the base fertilizer to meet the nutrient requirements of sweet potato during the whole growth period.
Biofertilizer: Biofertilizer contains a variety of beneficial microorganisms, which can promote the transformation of soil nutrients and improve fertilizer utilization efficiency. For sweet potatoes, biofertilizer can be used as a supplementary base fertilizer, combined with organic fertilizer or compound fertilizer to achieve better fertilization effect.
3. Fertilization recommendations.
Fertilization according to soil fertility conditions: plots with high soil fertility can appropriately reduce the amount of base fertilizer; For plots with low soil fertility, the amount of base fertilizer should be increased to improve the level of soil fertility.
Pay attention to fertilizer collocation: When applying base fertilizer, we should pay attention to the combination of organic fertilizer and inorganic fertilizer to give full play to their respective advantages and improve the fertilization effect. At the same time, avoid excessive application of nitrogen fertilizer, so as not to cause the growth of sweet potato stems and leaves, affecting the development of tubers.
Fertilization depth and location: the bottom fertilizer should be applied to the position of the deep soil layer, it is generally recommended to open a ditch in the middle of the sweet potato planting row for fertilization, and then cover the soil flat, so that the fertilizer and the soil are fully mixed, so as to facilitate the absorption of nutrients by the sweet potato roots.
IV. Conclusion. 
The choice of sweet potato base fertilizer has an important impact on the growth and development of sweet potato and the yield and quality of sweet potato. In the actual production process, organic fertilizer, compound fertilizer or biological fertilizer should be reasonably selected as the base fertilizer according to the soil fertility status, the characteristics of sweet potato fertilizer and fertilizer characteristics, and the principle of scientific fertilization should be followed to improve the fertilization effect and promote the high yield and high quality of sweet potato. Through continuous practice and exploration, we will contribute wisdom and strength to the sustainable development of the sweet potato industry and the improvement of agricultural production efficiency.