Fertility regulation of sweet potato 1. The number of three elements absorbed by sweet potatoes: Sweet potatoes are good potassium crops. According to research, for every 1,000 kilograms of fresh potatoes produced, it is necessary to absorb 3.5 kg of available nitrogen, 1.8 kg of phosphorus pentoxide, and 5 kg of potassium oxide from the soil. 2. Absorption characteristics of three elements in different growth periods of sweet potato: Sweet potato absorbs more potassium than nitrogen during the whole growth period, and absorbs more nitrogen than phosphorus. The absorption of three elements by sweet potato was dominated by the growth of stems and leaves to the late stage of tuber enlargement. Among them, the absorption of potassium was more from the growth period of stem and leaf to the return period, and the absorption of nitrogen was more prosperous. Phosphorus is relatively well-balanced throughout the growth process, but slightly increases before returning. 3. Effect of three-element fertilizer on yield: According to research, potassium has the greatest impact on sweet potato yield, followed by nitrogen and phosphorus. Therefore, for the sake of high quality and high yield of sweet potato, potassium fertilizer must be added, and nitrogen fertilizer and phosphate fertilizer should also be applied. Sweet potato high quality, high yield, pollution-free fertilization principle One must be scientifically formulated to balance nutrition so as to meet the demand for nutrients for high-yield indicators. Second, to reduce the use of chemical fertilizers, it will not only save production investment, but also reduce soil and environmental pollution caused by long-term heavy use of chemical fertilizers. Third, we must increase the application of organic fertilizers and bio-fertilizers to activate soils, improve soil quality, use land to cultivate land, and optimize soil ecological environment. Fourth, we must apply high-tech fertilization techniques, coordinate the use of soil nutrients, increase the utilization of chemical fertilizers, and achieve high efficiency, cost savings, quality, ecology, and safety. Comprehensive Technology of Optimum Fertilization Optimized for High-yield Sweet Potato Production According to the experimental research and production practice over the years, we have summed up the high-yield pollution-free optimized fertilization technology model for producing 3,000 to 4,000 kilograms of fresh potatoes per mu: 1. Combining organic, inorganic, and biotechnology, apply base fertilizer. Although sweet potato has the characteristics of resistance to ridges, it has a long growing period, strong fertility, and consumes more nutrients in the soil. Therefore, basal fertilizer must be applied in order to give full play to its high yield performance. On the basis of soil fertility testing and soil fertility, formula fertilization is applied to fertility above average, more than 1% organic matter in soil, more than 0.05% of available nitrogen, more than 20 ppm of available phosphorus, and one millionth of available potassium. More than 100 plots of land, usually Mushi quality farmyard fertilizer 3000-4000 kg plus GB (more than 200 million bacteria per g), 2-3 kg of biological bacterial fertilizer, plus NPK content of more than 15% of high-quality sulfuric acid Potassium compound fertilizer 30 kg. When there is no farmyard fertilizer, you can use Granville brand fulvic acid to activate phosphorus and potassium fertilizers instead of 50 to 60 kg per mu. Basal fertilizer can be applied once during site preparation, and according to the test results of soil testing, the amount of compound fertilizer can be appropriately increased or decreased in different fertility plots. Because the roots of sweet potatoes are concentrated in 25-30 cm soil layers, the basal fertilizer must be applied in a depth of 25-30 cm in order to facilitate the absorption of the roots. In order to deepen the plough layer, it is better to use the gullies for planting. The way. 2. Skillfully applying topdressing to make up for nutrition and promote healthy growth of plants. For the under-fertilized plots, according to the principle of lack of supplements and lack of supplements, fertilizers are applied in the early stage of potato block expansion. Generally, 7.5 to 10 kilograms of amino acid chelated NPK ternary compound fertilizer is applied to the top of the mu, or dihydrogen phosphate is used. Potassium 2 to 3 kg. The fertilization method is to apply a hole or water to dissolve the roots, each fertilizer 0.25 to 0.5 kg. 3. Scientifically use foliar fertilizers to balance nutrition and coordinate growth. The use of high-tech products and the implementation of foliar fertilization can balance nutrition, stimulate plant vigor, improve resilience, coordinate vegetative growth and reproductive growth, and greatly increase the magical effect of quality and yield. During the whole growth period, Lei Li2000 functional compound liquid fertilizer was sprayed 3 to 4 times, and 30 bags of 30 bags of water and 30 kilograms of leaves were sprayed with 2000 bags of Lei Li per acre. The yield increase effect was 20% to 30%. Can also use Laoxiang brand high-efficiency biological liquid fertilizer, spraying 3 times throughout the growing period. Each sweet potato special liquid fertilizer 1 bag 25 grams of water, 15 kilograms of stems and leaves spray, can increase production by about 30%. Home And Workplace First Aid Kits Home First Aid Kit,Fast Aid Box,Military First Aid Kit,Workplace First Aid Kit Dongguan City Risen Medical Products Co., Ltd. , https://www.risenppe.com