Lime nitrogen characteristics and application technology
February 05 09:20:12, 2021
Lime nitrogen, also known as calcium cyanamide, contains 20-22% nitrogen. It also contains calcium and a small amount of silicon, phosphorus, sulfur, iron and copper. It is a dark gray powder or fine granular nitrogen fertilizer. Water-soluble characteristics of delayed nitrogen fertilizer. In addition to its use as a fertilizer, it can also be used as a herbicide, fungicide, defoliant, and kill snails. In recent years, it has been used in soil disinfection of facilities. Lime nitrogen is highly toxic, and powdery lime nitrogen can easily fly, irritate the nasal mucosa, corrode the skin, and must be protected during transportation and application. It is also easy to absorb moisture and produce toxic dicyandiamide. It must be kept dry and ventilated during storage, and must not be exposed to livestock or children. Lime nitrogen is an alkaline fertilizer suitable for acidic and slightly acidic soils. The degradation process after the application of soil is more complex, and it takes a longer time to convert to fast-acting nitrogen. In acidic conditions, it is converted to cyano ammonia, converted to dicyandiamide under alkaline conditions, and then converted to cyanamide or dicyandiamide. The hydrolysis of urea into ammonium nitrogen is absorbed by the crops. Dicyandiamide formed in alkaline soil is not easy to decompose, crops are difficult to use, and there is a long-term inhibitory effect on soil microbial growth, so lime nitrogen should not be applied in alkaline soils. Lime nitrogen should be used as base fertilizer and it is not suitable for top dressing and seed fertilizer. The basal fertilizer should be applied before sowing, and it is better to apply deep soil after spreading. Cyanide-sensitive crops such as rapeseed, potatoes, etc. Generally not suitable for use. The use of rice, corn, wheat, cotton, hemp crops is better.
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