(1) Rational fertilization. In general, for plots with 3000-4000 kilograms of fresh potatoes per mu, 3000-4000 kilograms of organic fertilizer, 25 kilograms of potassium sulfate, 75 kilograms of calcium superphosphate or 20 kilograms of diammonium phosphate, and 25 kilograms of ammonium bicarbonate are used as base fertilizers. One month after planting, according to the growth situation, 5- 10 kg of urea can be topdressing per mu, and 75 kg of 0.3% potassium dihydrogen phosphate aqueous solution can be sprayed on the leaves in the middle and late September.

(2) Deep ploughing, loosening soil and ridging cultivation. The tillage depth is more than 20 cm, and the ridging height is 15-20 cm. In areas with high water and fertilizer, double rows of large ridges with a width of 60-72 cm and single ridges with a width of 45-54 cm can be used.

(3) Plastic film mulching promotes early development and increases yield. Leveling the ridge surface after ridging, evenly spraying 50 kg of acetochlor 125 ml water or 75 kg of 72% dur 100- 150 g water on the ridge surface, and then covering the film.

(4) Reasonable close planting. Planting spring potatoes from late April to mid-May, with 3000-3500 plants per mu. Summer potatoes should be planted from June 15 to July 5, with 4000-4500 plants per mu. Generally, 5000 plants are planted per mu in mountainous areas. The boat shape is more suitable for open cultivation, with three leaves exposed on the ground.

(5) Prevention and control of diseases, pests and weeds. At seedling stage, 250g of 50% phoxim was mixed with 20kg of fine soil, combined with intertillage, and spread on ridge surface to kill underground pests. Use 2 kilograms of Shennongdan point per mu to control root rot and nematodiasis. Pyrethroid pesticides can be used to control leaf-eating pests such as sweet potato moth in the late growth stage of sweet potato. Weeding in sweet potato seedling field can be eliminated by spraying with fine grass.

(6) Irrigation and drainage. The suitable soil moisture content of sweet potato is 60%-70%. Weed 2-3 times in intertillage before closing the ridge, and water once every 20-30 days after planting to prevent drought. In the middle and late period of drought, lightly water along the ridge. Sweet potatoes are afraid of waterlogging, and they should be drained when it rains heavily.

(7) control prosperity. Some virus-free sweet potato varieties grow vigorously, such as Xu Shu 18. When it grows 50-70 days after planting, 50-70 grams of paclobutrazol and 50 kilograms of water are sprayed per mu, generally 2-3 times. Don't turn over the vines, lift the vines and cut off the roots. Spray 1 g sweet potato swelling agent per mu to promote down control.