First, nurture strong seedlings and select suitable local resistant varieties, adopt seedling beds to cover the ground film, dig down the ventilation channels, and adjust the temperature of the litter-heated sand beds to cover the rapid concentration and seedling raising techniques. The seed potato bed can be sterilized with carbendazim spray, and then cover 7-8 cm of river sand on the seed potato, spray enough water on the sand, and cover the seedbed with plastic cloth, strictly control the temperature.
Second, ridge bed, cover film ridge distance 80 cm, ridge height of 20 to 25 cm, 1 row per ridge planting, cover film with phoxim granules to prevent the effect of underground pests. It can also be sprinkled into the hole when the seedlings are planted, sprayed with acetochlor to spray water, and then covered with a thin film.
Third, timely transplanting According to the local natural climatic conditions, to achieve timely planting, generally after the late frost, when the ground temperature stabilized at 15 °C can be planted. The planting density is determined according to the species and soil strength. The long vine cultivars should be thin and the short vine cultivars should be dense. The mutton seedlings per acre are maintained at 2500 to 4500, and the perforations are drilled at a depth of 10 to 12 centimeters at a distance of 30 to 35 cm. With the Zha Kong, the potato seedlings will be inserted into the holes in time, and the teapots will be used for watering and sealing.
Four, early management
1. Early irrigation: whether sweet potato can grow roots and shoots early, and early growth, the key lies in the suitable soil moisture, and the soil moisture is reported to be early seedlings and grow quickly. It is wet in the early stage, wet during the cold wave, and maintains loose soil around the Spring Festival, which is favorable for high yields.
2, early morning fertilizer: sweet potato early dressing, due to less rainfall, there are few leggy phenomenon, early dressing, conducive to early life, early tomb, generally after the planting 15, 35, 55 days of top dressing 1, the top dressings were: urea 8 Kg, potassium 4 kg; urea 12 kg, potassium 8 kg, phosphorus 15 kg; urea 10 kg, potassium 5 kg. After 70 days, 150 g of potassium dihydrogen phosphate and 0.5 kg of urea were used, and sprayed with 200 kg of clear water twice.
3. Early and medium tillage: Each time fertilization is combined with cultivating weeding and earth-cultivation, each soil should be thin and not thick, so as to help increase the temperature and promote the expansion of the block.
4, early extermination: sweet potato early warm, prone to sweet potato roll leafworm, sweet potato stem borer, aphids and other damage, early prevention and treatment, so that the early growth of stems and leaves well.
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