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2. The absorption characteristics of sweet potato in three different growth stages: sweet potato absorbs more potassium than nitrogen in the whole growth period, and absorbs more nitrogen than phosphorus. The absorption of the three elements of sweet potato is mainly from the peak of stem and leaf growth to the late stage of potato swell. The absorption of potassium is more in the growth period of stems and leaves to the stage of retanning, and the absorption of nitrogen is more abundant in the growth of stems and leaves. Phosphorus absorbed more well throughout the growth process, but increased slightly before returning.
3. Three-factor fertilizer yield increase effect: According to research, potassium has the greatest impact on sweet potato yield, followed by nitrogen and phosphorus. Therefore, sweet potato should be high-quality and high-yield, and it must be added with potassium fertilizer, and it should be combined with nitrogen fertilizer and phosphate fertilizer.
The principle of high-quality and high-yield pollution-free fertilization of sweet potato should be scientifically formulated and balanced to meet the demand for nutrients in high-yield indicators. Second, we must reduce the use of chemical fertilizers, not only save production investment, but also reduce the pollution of soil and environment caused by long-term use of chemical fertilizers. Third, it is necessary to increase the application of organic fertilizers and biological fertilizers, activate the soil, improve the soil quality, use land to raise land, and optimize the soil ecological environment. Fourth, it is necessary to apply high-tech fertilization technology, coordinate the use of soil nutrients, improve the utilization rate of chemical fertilizers, and achieve high efficiency, cost, quality, ecology and safety.
High-yield, pollution-free and optimized fertilization technology for sweet potato Based on years of experimental research and production practice, we have summarized the high-yield and pollution-free optimized fertilization technology model of 3,000-4,000 kg of fresh potato per mu:
1. Combine organic, inorganic and biotechnology to apply base fertilizer. Although sweet potato has the characteristics of resistance to ridges, it has a long growing period, strong fertility and consumes a lot of nutrients in the soil. Therefore, it is necessary to apply sufficient base fertilizer to fully exert its high-yield performance. On the basis of soil testing and soil fertility, formula fertilization is applied. For medium and above fertility, soil organic matter content is more than 1%, quick-acting nitrogen is more than 0.05%, quick-acting phosphorus is more than 20 parts per million, and quick-acting potassium is one-millionth. More than one hundred plots of land, generally high-quality farmyard manure 3000-4000 kg plus national standard (more than 200 million bacteria per gram) 2 to 3 kg of biological fertilizer, plus high-quality sulfuric acid with NPK content of 15% or more Potassium compound fertilizer 30 kg. When there is no farmyard manure, you can use the Granville brand fulvic acid to activate the phosphorus and potassium fertilizer instead of 50-60 kg per mu. The base fertilizer can be applied once at the time of land preparation, and according to the test results of soil testing, the amount of compound fertilizer can be appropriately increased or decreased according to different fertility plots. Because the root system of sweet potato is concentrated in the soil layer of 25-30 cm, the base fertilizer should be applied to the soil layer of 25-30 cm deep, which is beneficial to the absorption of roots. For deepening the tillage layer, it is best to adopt gully rafting and planting. The way.
2. Skillfully apply top dressing to make up the nutrients and promote the robust growth of the plants. For the plots with insufficient fertilization, according to the principle of lack of supplement and lack of much, the topdressing of the potato stalks should be carried out in the early stage of the expansion of the potato stalks. Generally, 7.5-10 kg of amino acid chelated NPK ternary compound fertilizer, or dihydrogen phosphate Potassium 2 to 3 kg. The fertilization method is root application or water dissolution and rooting, and each fertilizer solution is 0.25-0.5 kg.
3. Scientific use of foliar fertilizer, balance nutrition, and coordinate growth. The use of high-tech products to implement foliar fertilization can balance nutrients, stimulate plant vigor, improve resilience, coordinate vegetative growth and reproductive growth, and greatly enhance the magical effect of quality and yield. Spraying Leili 2000 functional compound liquid fertilizer for 3 to 4 times throughout the growing season, using 30 kg of two bags of Lei Li 2000 per acre, and spraying 30 kg of stem and leaf with water, the yield increase effect is 20% to 30%. It can also be used by Laoxiang brand high-efficiency biological liquid fertilizer. It can be sprayed 3 times in the whole growth period. Each batch of sweet potato special liquid fertilizer is used for 25 bags of water and 15 kilograms of water and 15 kilograms of stems and leaves. It can increase yield by about 30%.
From: Henan Daily Rural Edition
The fertilizer requirement of sweet potato 1. The number of three elements of sweet potato absorption: Sweet potato is a potassium-producing crop. According to research, for every 1000 kilograms of fresh potato produced, it is necessary to absorb 3.5 kg of available nitrogen, 1.8 kg of phosphorus pentoxide, and potassium oxide 5 from the soil. kg.
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