What are the characteristics of sweet potato fertilizer needs

What are the characteristics of sweet potato fertilizer needs

Sweet potatoes have a long growth period and require a large amount of fertilizer. Fertilization of sweet potatoes should be based on farm fertilizer and supplemented by chemical fertilizers.

A, the characteristics of sweet potato fertilizer needs

1, each production of 500kg of fresh sweet potatoes, need to absorb 1.86kg of nitrogen, 0.86kg of phosphorus pentoxide, 3.74kg of potassium nitrate from the soil. Among them, potassium demand is more, nitrogen is second, and phosphorus is less, the ratio is about 2:1:4.

2. Nitrogen fertilizer is absorbed more during the growth period of stems and leaves, and less during the expansion period of tubers. Phosphorus fertilizer, in the middle of stem and leaf growth, absorbed more, when the tuber expansion period, absorbed more. Potassium, from the beginning to the end, is absorbed more than nitrogen and phosphorus, especially during the tuber expansion period.