Since the research on syntheticnitrification inhibitorsin the United States in the mid-1950s, domestic and foreign scholars have carried out a lot of research on the effectiveness, safety and mechanism of different fertilizer synergists. With the development of technological innovation, new and efficient, environmentally friendly inhibitors continue to replace old products. This plays an important role in reducing greenhouse gas emissions, reducing nitrogen losses, reducing environmental pollution, promoting planting efficiency and promoting green development of agriculture.

At present, the resource and environmental constraints faced by China's agricultural development are becoming increasingly tight. It is one of the important measures to realize the sustainable development of agriculture in China by reducing the unreasonable application of fertilizer and improving the utilization rate of fertilizer. This has been widely recognized by the public. As a technical carrier to effectively improve fertilizer utilization, fertilizer synergists have received much attention. In China's agricultural industry standards and fertilizer management systems,nitrification inhibitorsandurease inhibitorsare collectively referred to as fertilizer synergists (NY/T 2543-2014). This is also consistent with the interpretation ofnitrification and urease inhibitorsin the International Code of Conduct on the Use and Management of Fertilizers (Draft), which is being developed by the Food and Agriculture Organization of the United Nations (FAO).

The use effect of fertilizer synergists is affected by many factors such as its own nature, environmental temperature and humidity, soil, etc. It must be scientifically and properly used to have the expected effect. Standardization is the key to good production, good management, and good use of such products. Up to now, the Chinese Academy of Agricultural Sciences resource zoning has led the completion of the agricultural industry standard NY/T 2877-2014 "Determination of dicyandiamide content of fertilizer synergist", NY/T 3037-2016 "fertilizer synergist 2-chloro Determination of -6-trichloromethylpyridine content, NY/T 3038-2016 "fertilizer synergist n-butyl thiophosphoric triamide (NBPT) and n-propyl thiophosphoric triamide (NBPT) content Method standard such as determination. Basic standards such as NY/T 2543-2014 "Fertilizer Synergist Effect Test and Evaluation Requirements" were also completed. The standard technical system of fertilizer synergists was initially constructed, which played a technical support role for the promotion, application and supervision of fertilizer synergists in China. At the same time, it also created the basic conditions for the next step to develop fertilizer synergist products and use standards.

Dr. Meng Yuanzhan, National Agricultural Technology Extension Service Center of the Ministry of Agriculture and Rural Affairs, believes that fertilizer synergists are in line with the national green development policy and are important technical products for achieving fertilizer reduction and efficiency. In its development and promotion, it can be integrated with the water and fertilizer integration project, make full use of water-saving irrigation technology and facilities, scientifically apply and better play the proper effect of fertilizer synergist.

The research and application of nitrification inhibitors and urease inhibitors in foreign countries started in China. However, in recent years, China has developed rapidly in this field, and new products have been applied to agricultural production. Fertilizer synergist products including 2-chloro-6-trichloromethylpyridine, NBPT and NPPT have also been included in the Agricultural and Rural Fertilizer Registration List.

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