The coated slow-release primary fertilizer was used to innovate the mode of blended fertilizer (BB fertilizer), with nitrogen as the core, and coating materials with strong affinity and film-forming properties on the surfaces of nitrogen, phosphorus and potassium fertilizers, respectively. Coated on the surface of fertilizer granules to form one or more layers of coating, it has the characteristics of "controlled nitrogen release, phosphorus-enhanced efficiency, and potassium loss prevention". This kind of fertilizer is different from the simple “mixing of prescriptions” as the general slow-release fertilizer N, P, and K. It is based on the nutrient characteristics of the crop, and the soil testing and formula fertilization is performed. According to the formulation, the special fertilizer is mixed. At the same time, the slow release function of single fertilizer was increased, and the fertilizer efficiency was significantly better than that of general BB fertilizer products.
In order to increase the utilization of fertilizers, the research team developed a unique coating solution as a slow-release technology carrier for slow-release primary fertilizer coating. This coating solution can complete the membrane reaction process under normal temperature and pressure, and thus can be conveniently Adding medium and trace elements, humic acid, fertilizer synergists, etc. in the coating solution increase the utilization of fertilizer. This open process structure makes it truly become an integrated platform that absorbs new types of slow-release technologies and new types of fertilizer products, becoming a “permanent new” product.
Third, innovative production technology, to achieve scale promotion International fertilizer research and fertilizer market presents a trend of high efficiency, compound / mixed, special, slow / controlled release. Following the demand of crop nutrients, according to the profit and loss of soil nutrients, the combined slow/controlled release fertilizers for whole-nutrition crops have become the forefront of fertilizer research and development. According to the characteristics of large-scale mechanized operations, the project developed a coated slow-release primary fertilizer product with characteristics of smooth particles, uniform particle size, no segregation, no moisture absorption and no agglomeration, and is suitable for mechanical fertilization. The multifunctional fertilization machinery developed by the research team broke the traditional fertilization mode, changed the ground surface application into a deep sowing machine, and changed it to a single crop several times in a season. At the same time, it achieved balanced fertilization, deep application of fertilizer, foundation support, and drought resistance. Save water, simplify cultivation and other multiple effects. High-quality fertilizers are used in conjunction with mechanical application and scientific management to achieve consistent specifications of fertilizer usage, depth, and methods, and provide technical support for standardized agricultural production and scale operations.
The slow-release primary fertilizer coating has a significant sustained-release effect, but the cost is only 3% to 5% higher than that of simple mechanical mixing, which generally increases the cost by 50 to 80 yuan per ton. Its production equipment can be transformed on general compound fertilizer equipment, and it can also be reconfigured. The investment in main equipment of a production line with an annual output of 100,000 tons of coated slow-release primary fertilizer (including 60,000 tons of potash granulation capacity) is about 2 million yuan. Therefore, large and medium-sized fertilizer companies and agricultural technology extension departments can produce.
In the United States, a farm with a radius of 50 kilometers has a fertilizer station. In China, a county can be built to implement a soil testing and fertilization program, so that the soil testing and fertilization project can truly become a “bag service” and allow farmers to Really use "fool technology." This will not only be beneficial to saving chemical fertilizers, reducing the pollution caused by over-application of chemical fertilizers, but also helping to reduce agricultural production costs and improving economic efficiency. This is effective in controlling agricultural non-point source pollution, increasing comprehensive agricultural production capacity, and building resource-efficient agriculture. The move is also a key point for building conservation-oriented agriculture.
The center has cooperated with the original Guangzhou Nitrogen Fertilizer Plant and Hainan Fudao Chemical Industry Co., Ltd. since the early 1990s to research and apply to improve the sustained release performance of large-particle urea. By the end of 1997, a total of 6.7 million mu of land had been expanded in Hebei Province, with 170 million kg of new grain, 7 million kg of lint and 170 million yuan of new benefits. After 16 years of research and application practice, the slow-release coated fertilizer has solved the “bottleneck” problem of high sustained-release cost with its unique slow-release theory, product structure, and fertilization measures, and achieved “a look at the arid and semi-arid agricultural area”. The crop only needs to be fertilized once, which provides new ideas for promoting fertilizer reduction and efficiency increase and developing modern agriculture.