Improve nitrogen fertilizer efficiency method

Nitrogen fertilizers commonly used in agricultural production include ammonium sulfate, ammonium chloride, ammonium bicarbonate, ammonia, liquid ammonia, ammonium nitrate, calcium ammonium nitrate, and urea. Studies have shown that, under field conditions, the nitrogen fertilizers absorbed by the crops of that year do not exceed 40-50% of the amount of chemical fertilizers used. If the application method is improper, the fertilizer utilization rate will be reduced from 40-50% to 20-30%. In order to reduce the loss of nitrogen nutrients and increase the utilization of nitrogen nutrients, the following methods can be taken:

1. Ammonium nitrogen fertilizer should be deep applied to the depth of 8-15 cm depth of ammonium fertilizer. It is advisable to cover the soil, which can increase the adsorption of ammonium ions on the soil, reduce the nitrogen nutrient volatilization, and increase its utilization. According to the experiment, deep application of the ground can generally increase the fertilizer efficiency by 10 to 25%.

2. The soil texture and organic matter content of soil applied to soil have influence on nitrogen fertilizer application. It is generally believed that sandy soil organic mineralization is fast, poor fertility, and should be applied less frequently; while the clay mineralization of organic matter is slow, the applied nitrogen fertilizer is easily fixed by soil colloids and microorganisms, and has strong fertilizer retention performance. , It can be a small amount of large; while the loam soil fertilization and fertilizer retention performance is excellent, according to the growth of plants determine the fertilization method.

3. Different plants have different requirements and types of nitrogen fertilizer due to different fertilizers. Such as leafy vegetables, tea, mulberry, etc. to harvest the leaves of plants need large amounts of nitrogen, with ammonium nitrogen is appropriate; bark, fiber plants such as hemp, Eucommia, Astragalus, etc. with ammonium chloride is more appropriate; flowers, Fruit trees are often better with ammonium nitrate nitrogen; the same plants need different amounts of nitrogen at different stages. In one year, the amount of nitrogen required in spring and summer is more than 52%, and the fruit expansion period needs to decrease. Therefore, nitrogen fertilizer should be applied early in time, especially in the fruit ripening period, do not apply nitrogen fertilizer to prevent late maturation.

4. With other fertilizer applications generally believe that China's soil has a "general nitrogen deficiency" of the general trend. However, if there is a lack of phosphorus, the utilization rate of nitrogen fertilizer is also very low. Therefore, the application of nitrogen in combination with phosphorus, potassium and trace element fertilizers and the application of nitrogen fertilizer and organic fertilizer are better.

5. Adding nitrogen synergist in nitrogen fertilizers Nitrogen fertilizer synergist is an organic chemical substance. When mixed with nitrogen fertilizer, it can inhibit the progress of soil nitrification and reduce the loss of nitrogen fertilizer due to denitrification. The synergists currently trial-produced and tested in China are: 2-Chloro-6 (trichloromethyl), pyridine (CP), thiourea (SU), 2-amino-4-chloro-6-methylpyrimidine (AM )Wait.

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