How to use nitrogen fertilizer synergist?

What are the nitrogen fertilizer synergists? How to use nitrogen fertilizer synergist? Also asked experienced netizens to help introduce nitrogen fertilizer synergists, also known as nitrification inhibitors, its composition is a class of organic chemicals, its actual properties are some fungicides. The mixed application of nitrogen synergist and nitrogen fertilizer in farmland can reduce the loss of nitrogen fertilizer caused by denitrification and improve the efficiency of nitrogen fertilizer. The main principle of nitrogen fertilizer synergist in soil is to inhibit the transformation from ammonium and urea to nitric acid, and the degree and length of inhibition depend on the performance of nitrification inhibitors and external conditions. The application effect of nitrogen synergist depends not only on the type and quantity of nitrification inhibitors used, but also on the different application conditions such as climate, season, soil and farming system. Therefore, the farming network sorted out the use of three nitrogen synergists, nitrogen-pyridine, dicyandiamide and 3jin4-dimethylpyrazole phosphate, which are listed in detail below for netizens' reference. Nitrogen-pyridine: the suitable dosage is about 1% of pure nitrogen. When the concentration of it in soil is 1100 mg / L, it has obvious inhibitory effect on soil nitrification, and the validity period is 30 days. Nitrogen-pyridine can increase yield or save fertilizer on rice, corn, wheat, sorghum, cotton, rape and other crops, but inhibit the growth and development of legume crops. Dicyandiamide: under the influence of dicyandiamide, ammonium in fertilizer can be stabilized for 6-8 weeks. Fertilizers with dicyandiamide can be applied to most crops, including ammonium sulfate, ammonium nitrate, urea and ammonium nitrate urea. The appropriate amount of dicyandiamide is 5% to 10% of the total nitrogen. It had obvious inhibitory effect on soil microorganisms within one month after application, and returned to normal after two and a half months. Dicyandiamide is not only a synergist but also a slow-acting nitrogen fertilizer. 3Jing 4-dimethylpyrazole phosphate: the application experiment on potato, summer corn and other crops has achieved a preliminary effect of saving nitrogen and increasing production. Matters needing attention in the selection and purchase of nitrogen fertilizer synergists: because there are many kinds of products containing nitrogen fertilizer synergists, it is necessary to refer to the effect of field experiments and the quality of the products. And pay attention to whether it is safe to people and animals, non-toxic to seedlings, and has little side effects on beneficial microorganisms such as soil rhizobium. Production enterprises should truthfully mark the types of nitrification inhibitors, the amount of nitrification inhibitors and the range of nitrogen fertilizer on the product bags, and should not replace the real ones with false ones. Different kinds of nitrogen fertilizer synergists are suitable to be added in different amounts, some with a proportion of 0.25% and some with a ratio of 0.7% to 1%. The effect of nitrogen fertilizer synergist varies greatly due to different application conditions. For example, most of the grain crops in irrigated fields increased production, while the fertilizer effect of vegetable crops was uncertain, and most legume crops showed reduced yields. Under the soil condition, the application effect of paddy field is better than that of dry land. What is nitrogen fertilizer? What should be paid attention to when applying urea?