Nitrogen fertilizer has strong activity and many loss paths. In addition, the unused nitrogen fertilizer is not easy to remain in the soil and is used by the next season crop. Therefore, the utilization rate of nitrogen fertilizer is relatively low, and the nitrogen fertilizer utilization rate of field crops in China is only about 30%. about. Therefore, the modification and enhancement of nitrogen fertilizer will become an important direction for the research of new fertilizers in China. Among the nitrogen fertilizer varieties in China, urea is the most important type, accounting for 90% of the elemental nitrogen fertilizer. Therefore, the urea modification effect is the focus of nitrogen fertilizer modification and efficiency. Synergistic urea is based on the basic urea production process, adding synergistic agents directly to the urine by adding simple equipment to produce synergistic urea products. There are many types of synergists, such as humic acid, amino acids and other organic or inorganic acids, algae, peptides, etc., the amount of addition is lower, mostly at 0.5%. ~5%. There is basically no influence on the urea nutrient content (46% nitrogen). Synergists are natural substances, extracts or synthetics that are harmless to the environment, crops and humans. The synergistic urea product has the characteristics of high productivity, low cost, good effect, and is more suitable for field crops. The principles for the development of synergistic urea in China include: (1) The nitrogen content of the synergistic urea is not less than 46%, which is in line with the current nitrogen content of urea products. (2) The synergistic agent is highly efficient, and the process is simple and the cost is low. (3) Determine the effect of increasing production, carry out verification experiments on network effects in different ecological zones, different types of soils and crops across the country, and clarify the effect of increasing production. (4) Clear synergistic mechanism, strengthen the synergistic mechanism of synergistic urea, and clarify the synergistic principle of synergists. (5) Scientific application methods, carry out regional trial demonstrations, and study suitable crops, regions, dosages and methods of use for synergistic urea products. (6) Scientific testing methods and standards, actively carry out research on synergistic urea standards, gradually develop from enterprise standards to industry standards or national standards, standardize the production and sales of synergistic urea, and promote the benign development of the synergistic urea industry. In March 2011, the Institute of Agricultural Resources and Agricultural Regionalization of the Chinese Academy of Agricultural Sciences and Shandong Ruixing Group cooperated to produce seaweed urea, humic acid urea and amino acid urea series of synergistic urea on the annual production of 200,000 tons of large urea production equipment. New products and established corporate standards for related products. The series of synergistic urea products produced in spring, corn, potato, cotton, winter wheat, summer in Heilongjiang, Jilin, Xinjiang, Inner Mongolia, Gansu, Shaanxi, Shandong, Henan, Hunan, Zhejiang, Hubei, Jiangxi, Sichuan, Chongqing, Guangzhou, etc. A wide range of effect verification tests were carried out on corn, peanut, rice, rapeseed and other field crops. The synergistic urea showed a general increase in yield, the crop yield increased by more than 10%, and the nitrogen fertilizer utilization rate increased by more than 10 percentage points, which marked China. Significant breakthroughs have been made in the large-scale industrialization of synergistic urea. The development potential of China's synergistic urea is very large, and it is possible to develop 10 million tons of synergistic urea.
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