Key points of fertilization techniques for planting Sweet Potato

The fertilization of sweet potato should be based on the climate, soil characteristics and the growth of each stage of plant growth. The summary is as follows:

Base fertilizer is the main measure of fertilization for sweet potato. The base fertilizer should be based on high-quality organic fertilizer. Sandy land has good permeability, large temperature difference between day and night, and poor ability to conserve water and fertilizer, so it is appropriate to use semi-rotten organic fertilizer as base fertilizer; clayey land should apply rotten organic fertilizer. Part of nitrogen fertilizer and all phosphorus and potassium fertilizer in chemical fertilizer can also be applied with base fertilizer at the same time. Topdressing if the amount of nitrogen applied to the base fertilizer is insufficient, it should be topdressing by stages, mainly in the middle stage. The specific period of topdressing should be mastered flexibly. If the soil is dry, the temperature is low and the potato seedlings are thin and weak, the seedling fertilizer can be applied early. In the branching period, the branches are late, the stems and leaves are not flourishing, and the leaves are small, so strong plant fertilizer should be applied early. If the plant grows normally, it can be fertilized less or not applied. In the period of rapid expansion of tuber, if the stem and leaf senescence prematurely, the leaf area index decreases rapidly, and when the defoliation rate increases, nitrogen fertilizer can be applied for 1-2 times, and the amount of nitrogen fertilizer can be determined according to climatic conditions and seedling conditions. When the soil is cracked and the tuber expands, in case of drought, the stems and leaves turn yellow earlier and the number of yellow leaves increases, more human and animal dung water should be applied. If the soil is moist, the autumn rain is much, when the stems and leaves turn yellow, you can use more plant ash, the weather is sunny for a long time, it can be 1-2 times, otherwise it should be reduced.