Potatoes have the characteristics of potassium tropism, and they have a greater demand for potassium, so more attention should be paid to the application of potassium fertilizer during cultivation. For every 1,000 kg of potato tubers produced, 5 kg of pure nitrogen, 2 kg of phosphorus pentachloride, and 10.6 kg of potassium chloride need to be absorbed from the soil. The absorption ratio of nitrogen, phosphorus and potassium is 1:0.4:2.1. After adding potassium fertilizer during the growth of potatoes, it can increase the turgor pressure of the crop cells, make the cells more elastic, regulate the opening or closing of the leaf cells, and help the crop absorb more carbon dioxide to produce carbohydrates, and form starch and sugar. Class; two can promote the development of roots, absorb more water, alleviate water evaporation, and improve the ability of crops to resist drought; three can promote the development of stalk cellulose, improve the supporting ability of stalks, and enhance the ability of crops to resist lodging and pests , It is conducive to the transportation of organic nutrients (starch) in crops to storage organs (underground rhizomes, fruits), accelerates the expansion of roots and pods, thereby increasing yield and improving quality. In potato production, potassium fertilizer is generally applied in two ways: base fertilizer and top dressing. For the distribution of nitrogen, phosphorus and potassium fertilizers, 50% of the nitrogen fertilizer is used in the base fertilizer, all of the phosphate fertilizer and most of the potash fertilizer. The fertilizer varieties of the base fertilizer can be selected from the concentration general-purpose compound fertilizer, or the element fertilizer can be used in combination. Urea, ammonium nitrate and potassium sulfate can be selected for 50% of nitrogen and a small part of potassium used in top dressing. When applying, you should catch the period when potatoes require the most potassium. One is in the seedling stage. Each acre can be applied with 3 to 5 kg of potassium chloride, potassium sulfate or 25 to 30 kg of plant ash (containing 7.5% effective potassium) as a base fertilizer, and evenly spread and mix soil and fertilizer during site preparation. Potassium fertilizer can also be used as seedling fertilizer topdressing. Use 2 to 3 kilograms of potassium fertilizer per acre to apply in strips or holes, with a depth of 10 to 15 cm. After fertilization, irrigate and cover soil. The second is in the tuber formation period. The same amount of potassium fertilizer mentioned above can be used per mu, and topdressing crack fertilizer and potato fertilizer can be applied after the potato chunks are enlarged or the pods are needled, which can effectively accelerate the infusion of organic nutrients from the stems and leaves into the potato chunks. In the late stage of potato growth, use 1% potassium sulfate or 0.3% potassium dihydrogen phosphate or 5% plant ash water (take the clarified liquid or filtrate after soaking for 24 hours), and spray 1 to 2 times outside the roots (interval time) 7-10 days), can reduce leaf temperature, is beneficial to drought resistance, and eliminate pests (combined with pest control), the effect is very strong. It should be noted that the top dressing time should not be too early, generally seize the tuber swelling period before proceeding. Applying fertilizer prematurely, especially after a large amount of nitrogen fertilizer is applied, will cause the above-ground part to grow vigorously and the underground part to form small potato pieces. Potassium chloride and potassium sulfate are both physiologically acidic fertilizers. Long-term application should prevent soil acidification and can be applied together with lime in an appropriate amount. Potassium chloride should not be applied in saline soil. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.bodybuildingoil.com