Appropriate amount of phosphate fertilizer can accelerate cell division, promote root growth, facilitate nutrient absorption and improve root quality. Appropriate amount of potassium fertilizer can improve photosynthetic efficiency, promote root growth, increase the number of root blocks, promote rapid root expansion and weight gain, and increase yield.
The results showed that potassium fertilizer had the greatest influence on the yield of sweet potato, followed by nitrogen fertilizer and phosphorus fertilizer. Farmers should understand the fertilizer demand characteristics of sweet potatoes, but they should not add potash fertilizer at will because potash fertilizer can increase production. Nitrogen and phosphorus fertilizers should be applied scientifically to improve fertilizer efficiency and meet growth needs.
Extended data
Sweet potato has good acid and alkali resistance and strong adaptability to soil environment. Its root system is developed and its ability to absorb fertilizer is strong, so it is appropriate to choose a plot with deep soil layer, loose soil, good soil quality, strong irrigation and drainage ability and pH value between 4.2 and 8.3.
Soil preparation and fertilization: soil preparation should be carried out in sunny days, and the soil should be broken and finely beaten. After leveling, apply fertilizer strips at the bottom of the ridge, with the ridge spacing of 80 cm and the ridge height of about 20 cm. Special organic compound fertilizer can be used as fertilizer. When the planting area is large, soil nitrogen, phosphorus, potassium and organic matter should be measured, and soil pH should also be measured in the south. It is not recommended to use ordinary compound fertilizer.
Topdressing in time: 750- 1000kg of dilute human and animal manure or 2.5kg of urea should be topdressing every 667m2 in the first intertillage about 15 days after transplanting. Potato topdressing is generally carried out in combination with secondary intertillage within one month after transplanting, with nitrogen fertilizer as the main fertilizer and phosphorus and potassium fertilizer as the auxiliary fertilizer. After the stems and leaves are closed, the roots grow faster, and topdressing is needed when cracks appear on the ground. Every 667m2, topdressing urea 1.5kg, calcium superphosphate leaching solution 10kg, and potassium sulfate 3kg with water 150-200kg are used to prepare a nutrient solution, which should be watered along the seam in cloudy or sunny afternoon, and uniform topdressing is required.
Baidu Encyclopedia-Sweet Potato (Sweet Potato)