High-yield and pollution-free optimized fertilization technology for sweet potato

First, organic, inorganic, and biotechnology are combined 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%, fast-acting nitrogen is more than 005%, 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 per gram of bacteria containing more than 200 million biological fertilizer 2 to 3 kg, plus NPK content of more than 15% of high-quality potassium sulfate complex 30 kg of fertilizer. 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.

The second is to apply top dressing to supplement the nutrition and promote the robust growth of the plant. For the plots with insufficient fertilization, according to the principle of deficiency of sputum and deficiency, and how much to make up, the topdressing of the potato stalks should be carried out in the early stage of the expansion of the potato stalks, and the amino acid chelating NPK ternary compound fertilizer is generally applied to 75 to 10 kg, or dihydrogen phosphate. Potassium 2 to 3 kg. The fertilization method is root application or water dissolution and rooting, and each fertilizer solution is 025~05 kg.

The third is the scientific use of foliar fertilizer, balanced nutrition, and coordinated 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 the Lei 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 to increase the yield by 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%.
Huaxian Agricultural Technology Promotion Center Lu Shuguang

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