The application of fertilizer technology to potatoes should follow the principle of applying farmyard manure, supplemented by chemical fertilizers, based on base fertilizer and appropriate topdressing.
   First, re-apply the base fertilizer.
   Under normal circumstances, the use of base fertilizer accounts for more than two-thirds of the total fertilization amount. The base fertilizer is mainly based on fully decomposed farmyard manure, and the application of appropriate amount of fertilizer, especially phosphorus-potassium fertilizer as base fertilizer, can make the soil The physical properties are well improved and are very beneficial for growth and potato formation. The application rate of nitrogen fertilizer in the base fertilizer accounts for about 50%. The application technique of the base fertilizer is ditch application or hole application before cultivation, and the depth is about 15 cm. The specific fertilizer is about 1500 kg per mu. The organic fertilizer is 1500 kg to 2500 kg per mu , 20 kg urea , 20 to 30 kg calcium, 10 to 12 kg potassium, or high nitrogen and potassium. Compound fertilizers range from 40 kg to 60 kg, and the amount of fertilizer applied in high-yield areas can be appropriately increased. Fertilizer should be applied 2-3 cm away from the seed potato to avoid direct contact with the seed potato and cover the soil after fertilization.
Second, timely topdressing. Topdressing should be combined with the growth and development of potatoes for scientific and rational application. In the seedling stage, it is necessary to apply nitrogen fertilizer. It can be combined with cultivating soil to apply urea from 5 kg to 8 kg per acre , which is very beneficial to the seedling. After the flowering of the potato, it is usually not necessary to carry out the rhizosphere top dressing, especially the nitrogen fertilizer can not be applied. After the flowering of the potato, the phosphorus and potassium fertilizers are mainly applied on the foliar surface, and the average surface area per acre is sprayed by 0.3%. To 0.5% of potassium dihydrogen phosphate solution, about 50 kg, if it is lack of nitrogen, it can increase 100 g to 150 g of urea, spray once every 10 to 15 days, spray 2 to 3 continuously. Times. Potatoes are particularly sensitive to boron and zinc. If the soil lacks boron or lacks zinc, it can be applied with 0.1 to 0.3% borax or zinc sulfate for external application, usually every week. Spray once, even spray twice, and apply an average of 50 kg to 70 kg per acre . In particular, it is necessary to remind farmers that potatoes are a kind of potassium-loving crops, and special attention should be paid to the application of potash fertilizer in balanced fertilization. At the same time, it is not appropriate to apply too much chlorine-containing fertilizer, such as potassium chloride, potassium sulfate should be used, otherwise it will affect the quality of the potato.
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