Sweet potatoes are potash-loving crops. Potassium is easily fixed in the soil and is not easy to move. After applying potassium fertilizer in the later stage can improve the yield and quality of sweet potatoes, but do not use chlorinated fertilizers for fertilization of sweet potatoes.

1. Apply base fertilizer

Base fertilizer is the key fertilizer to ensure the healthy growth of sweet potato seedlings and even the entire growth period. When applying basal fertilizer, it is mainly farm fertilizer and compound fertilizer. Generally, the proportion of farm manure is about 70%, about 3000 kg of farm manure is applied per mu, and compound fertilizers such as superphosphate and the like are added.

2. Topdressing the seedlings

Raising fertilizers is mainly to meet the nutrients needed for the growth of seedlings and enhance the growth ability of seedlings. Nitrogen fertilizer is the main method for raising seedlings, which will be carried out together with supplementing seedlings about 4 days after the seedlings are planted.

3. Topdressing strong manure

After the sweet potato seedlings are planted for about one month, top-up manure is applied. The main manure is usually nitrogen fertilizer and potassium sulfate. Control the amount of fertilizer according to the fertility of the soil and the growth of seedlings.

4. Topdressing the manure

Cultivation of vine fertilizer is mainly to promote the growth of sweet potato vines, usually according to the actual situation to start topdressing about 3 months after planting. The fertilizing fertilizer is mainly based on potassium fertilizer, which can effectively improve the growth ability of the leaves and promote the growth of the stems and leaves of sweet potato plants. Strengthen photosynthesis, increase the accumulation of photosynthetic substances in plants, and provide sufficient nutrition for the expansion of sweet potato tubers.

Sweet potato special fertilizer

15-15-15, 14-16-15, 15-8-20 (shotcreting process)

22-6-18, 21-6-13, 19-5-21, 17-6-23, 18-12-18, 17-5-26, 17-17-17, 17-5-26 (high tower sulfur base)