The ratio of nitrogen, phosphorus and potassium for sweet potatoes is generally 2:1:3. Under the production level of 2 500 kg fresh potatoes per mu, about 20 kg of nitrogen, 15 kg of phosphorus and 35 kg of potassium are required. Base fertilizer accounts for 70%, and top dressing is 30%. It is advisable to use a small amount of localized fertilization. It is best to embed the fertilizer in the center of the ridge body during ridging, so that the sweet potato can absorb enough nitrogen at the seedling stage and rapidly increase the leaf area. In the middle and later stages, nitrogen is gradually consumed and is not easily caused. Prosperous later.
See seedlings and fertilizers to promote seedling fertilizer, strong tree fertilizer and large-scale fertilizer. The Miao Miao Fei is about 7 days after planting. According to the growth of the potato seedlings, a small amount of available nitrogen fertilizer can be used to ensure that the seedlings are even and strong and promote early-onset trees. In the ridging period if the seedlings can not be strong after the cultivation of strong trees, promote early potato and early ridge closure. If there is premature failure of stems and leaves in the middle and late stages, the sweet potato can be sprayed with large-scale fertilizer, mainly potassium fertilizer, and can also be applied as a crack fertilizer in the root.
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