What is lime nitrogen? How to use it in agriculture?

What's lime nitrogen? How is it used in agriculture? Is there any netizen who knows to help introduce Lime nitrogen is also called calcium cyanamide. Generally, the nitrogen content of lime nitrogen is about 20%~22%. Lime nitrogen is a good fertilizer with great use value in the production of pollution-free agricultural products. It is also a soil purifier with both medicine and fertilizer. Lime nitrogen has the dual function of soil disinfection and fertility, and is commonly used in vegetable growing areas. Therefore, the function and use method of lime nitrogen have been sorted out by farming network, and the following are listed in detail for netizens 'reference. The role of lime nitrogen: Function 1. Lime nitrogen application can improve soil structure and inhibit the occurrence of diseases and insect pests, thus improving vegetable quality and yield. Lime nitrogen contains more than 38% calcium, which can meet the demand for calcium in plant growth, especially for calcium-loving plants. Function 3: Lime nitrogen releases slowly to nitrogen, and ammonium nitrogen formed by lime nitrogen decomposition is not easy to lose in soil, and the fertilizer effect period can reach 3~4 months, which can meet the demand for nitrogen fertilizer in the early growth of vegetable crops, reduce the application amount of chemical nitrogen fertilizer, and reduce the nitrate content in agricultural products. Lime nitrogen can decompose calcium hydroxide in the soil, has a neutralizing effect on acidic soil, can also prevent calcium deficiency in crops, reduce the occurrence of physiological diseases of fruits, such as tomato umbilical rot, cabbage dry heartburn, etc. Lime nitrogen can also increase the storage tolerance of fruits and vegetables. Function 5, lime nitrogen can promote the decomposition of organic matter such as straw in compost. How to use lime nitrogen: Method 1. Cyanamide and dicyanamide, the intermediate products of lime nitrogen decomposition, have the functions of disinfection, pest control and disease prevention. After plum rain season, the soil of the protected land is ploughed at high temperature immediately, 70-100kg of lime nitrogen and 600-1200kg of straw are applied to each mu of ploughed soil, irrigation is carried out after ploughing, transparent plastic film is covered, and the greenhouse is sealed for 20-30 days. It can control various soil-borne diseases and underground pests, especially fungal diseases, such as sclerotinia of lettuce, stem rot of pea, root swelling disease, root rot, soft rot of cruciferous vegetables, blight and blight of spinach, etc. The control effect on clubroot disease of cruciferous vegetables can reach more than 95%, and the yield of Chinese cabbage can be increased by 33-42%. Lime nitrogen disinfection method has the advantages of good effect, low cost, no residual poison, safe operation, etc., but it also has the disadvantage of taking a long time. Method 2, before rice transplanting, rough plough paddy field, keep water depth 3 - 4 cm, 3-4 days later, evenly sprinkle lime nitrogen 13.3-20kg per mu, after 3-4 days, soil preparation planting, but must adjust the amount of nitrogen fertilizer. It can also be used after rice harvest. After harvest, keep the water depth 3- 4cm, and evenly apply lime nitrogen 13.3- 20kg per mu. The snails died after being immersed in 300mg/kg lime nitrogen solution for 3 days. However, the outflow of field water must be strictly controlled during operation, so as not to affect the growth of animals and plants in nearby fields and waters. Method 3. After rice harvest, applying lime nitrogen 26.7- 33.3kg/mu as soon as possible can break the dormancy of barnyardgrass seeds, make them germinate and grow before winter, and make them die naturally by using low temperature in winter. This is an effective way to reduce barnyardgrass damage. Method 4. Applying 20% lime nitrogen solution to grape branches (dormant buds) can make grapes germinate 3 weeks earlier and harvest 15 days earlier, and the economic benefits are greatly improved. Method 5. Lime nitrogen can also promote the germination of fruit branches and vegetative propagules (tubers, corms, etc.), so that crops mature early and improve economic benefits. For example, potato seeds soaked in 15% lime nitrogen solution for 5 minutes can germinate 1-2 weeks ahead of time, and the number of buds is more and the yield is higher. Cultivated asparagus can be watered with 20g lime nitrogen dissolved in 2 kg water (about 33.3 kg/mu) in the middle and late December, and it can sprout neatly after 12 days. Method 6. Lime nitrogen application could advance the initial flowering stage of pear trees by about 10 days, increase the germination rate by more than 2 times, and increase the average number of flowers in pear flower order. The optimum concentration of lime nitrogen solution was 16.7%. Lime nitrogen use precautions: Note that lime nitrogen should not be applied to alkaline soil. Lime nitrogen should not be applied to barren sandy soil and peat soil. Note 2, lime nitrogen should not be used directly as seed fertilizer and topdressing application, only suitable for basal fertilizer application. Note that lime nitrogen should not be mixed with microbial fertilizers, because lime nitrogen will kill microorganisms. Note 4. Wear protective equipment when applying lime nitrogen, such as glasses, rubber gloves, masks, long clothes and trousers, because lime nitrogen belongs to alkaline fertilizer, and inadvertent contact will lead to alkaline allergic reaction. What is ammonium nitrate? What is calcium potassium nitrate?