One is to topdress the seedlings. 7~10 days after planting, cultivating, using 20~30 tons of manure and manure for 10~15 kg of ammonium bicarbonate or 5 kg of urea (preferably 40% of high-efficiency compound fertilizer 7~10 kg); 100~150kg mixed superphosphate 25~30kg should be applied to the pond, don't apply it in the pond (the base fertilizer uses high-efficiency compound fertilizer only to use human and animal manure to raise seedlings); when the vine leaves are closed, the mud uses 21.8% sulfuric acid. 0.5 kg of zinc or 0.5 kg of compound zinc fertilizer on 50 kg of foliar spray; in early October, 100 g of potassium dihydrogen phosphate, 150 g of urea, and 2 to 3 times of 50 kg of leaf spray on water. The second is the tip of the branches. When the sweet potato seedlings survive, remove all the shoot tips, shorten the vines, increase the branches, increase the green leaves, improve the plant type, and facilitate the potato. Note: Do not turn the vine, not to "smash the vine", the long vine can be vine, cut the roots, control the length. The third is to prevent sputum. It is necessary to clear the ditch at any time, repair the ridge surface, and ensure that there is no water in the ditch. The fourth is timely harvest. In the middle of November, the sweet potato was harvested, and the potato pieces were used for seeding, eating or forage, and the vines were used as vegetables, and the vine leaves were used as feed. Note: Too late to harvest will reduce yield, quality and storability. As the fresh potato is listed, it can be properly harvested in advance. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone NINGBO MEDICAL EQUIPMENT CO.,LTD , https://www.techartmeds.com