The characteristics of ammonium nitrate and the modified fertilizer grade ammonium nitrate containing nitrogen (N) are 33% to 34%, which are commonly used in Europe, North America and some temperate regions. From the demand of crop nitrogen nutrition for fertilizer, ammonium nitrate has the advantages of quick fertilizer effect and can supply both nitrogen and nitrate forms of nitrogen source, which is undoubtedly beneficial to the growth of many crops. A large number of application facts have shown that in addition to crops grown in a few paddy fields such as rice, the majority of crops, especially fruit crops, melons, tobacco and other cash crops in dry farming, prefer ammonium nitrate. However, from the evaluation of chemical properties of fertilizers, ammonium nitrate is a kind of nitrogen fertilizer which is highly soluble in water and has strong hygroscopicity, agglomeration and flammability and explosiveness. These characteristics not only bring great difficulties to agricultural use, but also determine that if the ammonium nitrate is improperly managed during storage and transportation, it may cause fire or explosion. In fact, many countries in the world, including China, have experienced major accidents caused by ammonium nitrate. To this end, China has banned ammonium nitrate from entering the fertilizer market.
In recent years, with the expansion of fertigation area, the demand for agricultural ammonium nitrate has increased. Some manufacturers will improve their performance and improve their quality as the goal of the effort, and there are modified ammonium nitrate products on the market. In the technical transformation path, the following three methods are adopted: First, the production of granular ammonium nitrate, and adding a low hygroscopic stabilizer or adding an insoluble inert substance such as bone powder, phosphate rock, white cloud before granulation. Stone, sorghum and diatomaceous earth; secondly, a film-forming agent is used to coat the surface of the ammonium nitrate particles with a protective film to isolate the air. The commonly used film-forming agents are vegetable oil, mineral oil, resin and paraffin; Third, appropriate changes in the composition of ammonium nitrate, production of calcium ammonium nitrate, ammonium sulphate and ammonium phosphate. In the early days, some countries in Europe banned the application of single ammonium nitrate in agricultural applications. Some manufacturers applied ammonium sulfate, magnesium nitrate, potassium chloride, calcium nitrate, etc. to ammonium nitrate to make compound fertilizers. All the above technical methods can improve the bad traits of ammonium nitrate.
The following describes calcium ammonium nitrate, which is a commonly used ammonium nitrate modified product at home and abroad.
The characteristics of calcium ammonium nitrate and the application of calcium ammonium nitrate (formula NH4NO3 + CaCO3) are prepared by mixing and melting molten ammonium nitrate and limestone powder in a ratio of 60:40, and also using dolomite (a mixture of calcium carbonate and magnesium carbonate). ) and manufactured by ammonium nitrate. Contains about 20% nitrogen. As for the detailed composition, there are some differences in the products produced by different manufacturers. For example, the zema brand calcium ammonium nitrate of Depot Group Co., Ltd. contains 27% nitrogen (N), of which ammonium fluoride is 13.5%, nitrate nitrogen is 13.5%, calcium (CaO) is 12%, and average particle size is 3.0. ~ 3.6mm, the capacity is about 1.0 tons / cubic meter. The appearance color of calcium ammonium nitrate is generally gray or taupe particles, and also has a green color. Among them, ammonium nitrogen and nitrate nitrogen account for half each, and the nitrogen content is much less than the original ammonium nitrate. However, it has low hygroscopicity, is not easy to agglomerate, has good dispersibility, and has good physical properties.
Calcium ammonium nitrate contains a large amount of calcium carbonate, and has a good effect and effect as a top dressing on acidic soil. In paddy field application, the fertilizer efficiency is slightly lower than that of ammonium nitrate, and in dry land, the fertilizer efficiency is similar to that of ammonium sulfate. The cost of nitrogen in calcium ammonium nitrate is higher than the cost of nitrogen in common ammonium nitrate. Calcium ammonium nitrate is a physiologically neutral fertilizer as a low concentration fertilizer. Long-term application plays a good role in soil properties. It can be used as a top dressing on cereal crops.
Nitrogen in calcium ammonium nitrate particles can be released faster, while lime dissolves very slowly. The field test results in acid soil show that the agronomic effect of calcium ammonium nitrate is good and can increase the total level of yield.
(Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping)
In recent years, with the expansion of fertigation area, the demand for agricultural ammonium nitrate has increased. Some manufacturers will improve their performance and improve their quality as the goal of the effort, and there are modified ammonium nitrate products on the market. In the technical transformation path, the following three methods are adopted: First, the production of granular ammonium nitrate, and adding a low hygroscopic stabilizer or adding an insoluble inert substance such as bone powder, phosphate rock, white cloud before granulation. Stone, sorghum and diatomaceous earth; secondly, a film-forming agent is used to coat the surface of the ammonium nitrate particles with a protective film to isolate the air. The commonly used film-forming agents are vegetable oil, mineral oil, resin and paraffin; Third, appropriate changes in the composition of ammonium nitrate, production of calcium ammonium nitrate, ammonium sulphate and ammonium phosphate. In the early days, some countries in Europe banned the application of single ammonium nitrate in agricultural applications. Some manufacturers applied ammonium sulfate, magnesium nitrate, potassium chloride, calcium nitrate, etc. to ammonium nitrate to make compound fertilizers. All the above technical methods can improve the bad traits of ammonium nitrate.
The following describes calcium ammonium nitrate, which is a commonly used ammonium nitrate modified product at home and abroad.
The characteristics of calcium ammonium nitrate and the application of calcium ammonium nitrate (formula NH4NO3 + CaCO3) are prepared by mixing and melting molten ammonium nitrate and limestone powder in a ratio of 60:40, and also using dolomite (a mixture of calcium carbonate and magnesium carbonate). ) and manufactured by ammonium nitrate. Contains about 20% nitrogen. As for the detailed composition, there are some differences in the products produced by different manufacturers. For example, the zema brand calcium ammonium nitrate of Depot Group Co., Ltd. contains 27% nitrogen (N), of which ammonium fluoride is 13.5%, nitrate nitrogen is 13.5%, calcium (CaO) is 12%, and average particle size is 3.0. ~ 3.6mm, the capacity is about 1.0 tons / cubic meter. The appearance color of calcium ammonium nitrate is generally gray or taupe particles, and also has a green color. Among them, ammonium nitrogen and nitrate nitrogen account for half each, and the nitrogen content is much less than the original ammonium nitrate. However, it has low hygroscopicity, is not easy to agglomerate, has good dispersibility, and has good physical properties.
Calcium ammonium nitrate contains a large amount of calcium carbonate, and has a good effect and effect as a top dressing on acidic soil. In paddy field application, the fertilizer efficiency is slightly lower than that of ammonium nitrate, and in dry land, the fertilizer efficiency is similar to that of ammonium sulfate. The cost of nitrogen in calcium ammonium nitrate is higher than the cost of nitrogen in common ammonium nitrate. Calcium ammonium nitrate is a physiologically neutral fertilizer as a low concentration fertilizer. Long-term application plays a good role in soil properties. It can be used as a top dressing on cereal crops.
Nitrogen in calcium ammonium nitrate particles can be released faster, while lime dissolves very slowly. The field test results in acid soil show that the agronomic effect of calcium ammonium nitrate is good and can increase the total level of yield.
(Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping)
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