The first is to raise the seedlings to cultivate 7-10 days after planting seedlings, mu of manure water 20-30 bear 10-15 kilograms of ammonium or urea 5 kilograms (preferably with 40% efficient compound fertilizer 7-10 kilograms) Guan Tong; At the same time, 100-150 kilograms of plant ash mixed with 25-30 kilograms of calcium superphosphate are applied to the ridges, not on the ridges (the base fertilizer is only used to raise seedlings with human and animal waste water); when vine leaves are ridged, Mu 21.8% zinc sulfate 0.5 kg or compound zinc fertilizer 0.8 kg water 50 kg foliar spray; In early October, 100 mu potassium dihydrogen phosphate, 150 g urea, 50 kg foliar spray of water 2-3 Times.
The second is to remove vines and cut roots, not to turn vines in the high temperature and rainy season. The soil moisture is too high. Some sweet potato varieties take root too much. Especially in high-fertilizer paddy fields, the white roots of sweet potato are much deeper. The vines can control the length of stems and leaves. At the same time, they can be dried in ridges to improve soil permeability. However, during this period, vines cannot be turned because they tend to damage the stems and leaves, disturbing the uniform distribution of the leaves, affecting the photosynthetic efficiency of the leaves, and resulting in reduced yields.
The third is the prevention of droughts and floods. During this period, most areas in our province were hot and rainy. The stems and leaves of sweet potato grew rapidly and the nutrients did not rise downward. At this time, drainage should be paid attention to. Prosperous. If it is dry, it needs to be watered and drought-proof so that it can quickly expand in wet soil.
The fourth is to pay attention to pest control, growth period mainly root rot, stem nematode disease, Spodoptera litura, sweet potato moth and other pests. Pay attention to the protection and use of natural enemies to prevent sweet potato insect pests, and use the phototaxis and tropism of pests to seduce or kill artificially. When the pest enters the primordial or larvae of leaf-eating pests, in the presupposition of 3 Spirits, the use of biopesticide sprays to control pests.
The fifth is to timely harvest in the middle of November to harvest sweet potato, potato block for planting, food or feed, vine tip for vegetables, vine leaves and silage for feed. Note: Harvesting too early and late will reduce yield, quality and storability. Fresh potatoes may be dug in advance as early as possible.

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