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Fertilization of sweet potato should adopt appropriate fertilization methods according to climate, soil characteristics and growth of each growth stage of the plant. The principle of sweet potato fertilization is that the sand land topdressing should be a small number of times, the number of top dressings is reduced, and the amount of topdressing can be increased appropriately. Under the condition of sufficient water source and good water conditions, the amount of nitrogen fertilizer should be controlled to avoid causing the stems and leaves to grow and affect the potato chips. Growth, otherwise it will reduce production, and the fertilizer is not high. The specific technical points of sweet potato fertilization are as follows:
1, base fertilizer: sweet potato fertilization based on base fertilizer. The base fertilizer should be based on high quality organic fertilizer. Sandy land, good permeability, large temperature difference between day and night, poor water retention and fertilizer retention, it is better to use semi-fertilized organic fertilizer as base fertilizer; clay soil should be applied to decomposed organic fertilizer. Nitrogen fertilizer and phosphorus and potassium fertilizers can also be applied simultaneously with the base fertilizer.
2, top dressing: If the amount of nitrogen applied to the base fertilizer is insufficient, it should be topdressed in the same period, and in the medium term. When the soil is planted, the soil is dry, the temperature is low, and the potato seedlings are weak, so that the seedling fertilizer can be applied early. In the branching and potato-growing stage, the branching is late, the stems and leaves are not growing vigorously, and the leaves are small, and the plant fertilizer should be applied early. The plants grow normally and can be applied less or not. Entering the rapid expansion period of potato chips, you can chase 1-2 times of nitrogen fertilizer, and the dosage is determined according to climatic conditions and seedling conditions. When the soil is cracked and the potato is swollen, in case of drought, when the number of yellow leaves increases, more manure should be applied. If the soil is moist, the autumn rain is more, and the stems and leaves turn yellow, the grass ash can be used for top dressing.
Huaxian County Shang Hongyan
Sweet potato fertilization technology
Fertilizer characteristics of sweet potato: Sweet potato is a combination of grain and vegetable, and has high nutritional value. It is also an industrial raw material. The sweet potato roots are deep and wide, and the stems and vines can take root and have a strong ability to absorb fertilizer. A certain amount of production can also be obtained on poor soil. Sweet potato is a potassium-tolerant chlorine crop. The application of potassium fertilizer has a significant effect on the yield and quality. When the application of ammonium chloride, potassium chloride and other chlorinated fertilizers exceeds a certain amount, the starch content of the potato will be reduced, and the potato tubing is reduced. Not resistant to storage.
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