The addition of nitrification inhibitors to common nitrogen fertilizers (including ammonium, ammonia and urea) and nitrogen-containing compound fertilizers is called stabilizing fertilizer. Nitrification inhibitors are commonly called “nitrogen fertilizer synergistsâ€. It can be seen that nitrification inhibitors are substances that can increase the stability of ammonium and urea, thereby increasing the nitrogen fertilizer efficiency.
Common nitration inhibitors are listed below: Nitrogen-pyridine, code-named CP, trade name N-Serve. Utilizing nitrification inhibitors in US farms tends to apply nitrogen fertilizer plus nitrification inhibitors in the autumn or nitrogen fertilizer and nitrification inhibitors in the spring. Crops are commonly used in corn, sorghum and wheat. The suitable amount of nitrogen-pyridine is about 1% of the effective component of nitrogen fertilizer. When it is in the soil concentration of 1-100ppm, it has a significant inhibitory effect on soil nitrification, and the effective period is 30 days. The experiments conducted by the Chinese Academy of Agricultural Sciences in the 1980s showed that crops such as rice, corn, wheat, sorghum, cotton, rubber, rape, etc. have the effect of increasing yield or reducing fertilizer. However, domestic and foreign trials have shown that it has an inhibitory effect on the growth and development of leguminous crops, such as continuous application of residual toxic phytotoxicity on soybeans, and soybeans have a tendency to reduce production.
Dicyandiamide, code-named DCD. Under the influence of dicyandiamide, the ammonium in the fertilizer can be stabilized for 6-8 weeks. The duration of the stabilization depends on the total amount of nitrogen applied and the proportion of dicyandiamide added, in addition to soil temperature and humidity. The dicyandiamide-added fertilizer can be applied to most crop types. Nitrogen-containing fertilizers include ammonium sulfate, ammonium nitrate, urea, and ammonium nitrate, and the suitable ratio is that the dicyandiamide nitrogen accounts for the total nitrogen. 5%-10%. Within one month after application, there was a significant inhibitory effect on the soil microorganisms and returned to normal after two and a half months. The application amount is 10% of the amount of nitrogen fertilizer (in terms of active ingredient). Dicyandiamide is both a synergist and a slow-acting nitrogen fertilizer.
3,4-Dimethylpyrazole phosphate, codenamed DMPP, under the trade name "Entec". After the application test on potato, summer corn, banana and other crops, the effect of increasing nitrogen production has been initially achieved.
In recent years, such stable fertilizers have developed rapidly and there are many items on the market. Farmers often ask about the principles of application of these fertilizers. They are briefly described as follows:
First we must understand and choose. Manufacturers should make clear indications on product packaging bags, and they should not use virtual reality. Such as the type of nitrification inhibitor, the amount of addition, the amount of nitrogen fertilizer. Because each type has its own appropriate amount of addition, some are 0.25% and others are 0.7%-1%.
The effect of nitrogen fertilizer synergists varies greatly depending on the application conditions. For example, most of the irrigated food crops have increased their production, while the vegetable crops have indeterminate fertilizer effects, and most legume crops have reduced their yields. The application of soil conditions to paddy fields is better than dryland and so on.
At present, there is a wide variety of products in the agricultural capital market. The choice of farmers' friends in the end is generally considered in two ways. One should refer to the field test results, product quality. Second, we must pay attention to whether it is safe to humans and animals, and do not harm the seedlings; the side effects such as soil rhizobia and other beneficial microorganisms should be small.
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