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1. The nitrogen content is high, and the nitrogen content of urea is between 44% and 46%, which is the highest nitrogen fertilizer in solid nitrogen fertilizer. The nitrogen in each kg of urea is equivalent to 2.4 kg of ammonium sulfate or 2.7 kg of ammonium bicarbonate. Due to the high nitrogen content of urea, it is more efficient than other nitrogen fertilizers in transportation, storage, packaging and application. Therefore, urea is a favorite nitrogen fertilizer variety of farmers, but it is precisely because of the high nitrogen content of urea, so the application amount should be specially controlled. If the control is not strict, the utilization rate will be low, and in severe cases, the seedlings will burn and pollute the environment.
2. It is easily soluble in water. It has stable physical and chemical properties before being applied to the soil, and its hygroscopicity is relatively small. It is a quick-acting nitrogen fertilizer with stable commodity shape.
3. Urea is a neutral fertilizer, widely used in a variety of soils and a variety of crops, long-term application, will not make the soil worse, when the nitrogen is absorbed, the remaining carbonate can still promote other elements that are not easily soluble Dissolve and become an effective ingredient.
4. Compared with ammonium nitrogen fertilizer, the fertilizer efficiency is relatively slow, so urea should be applied in advance for top dressing.
5. The conversion products of urea after being applied to the soil are ammonium carbonate and ammonium hydrogencarbonate. Therefore, the agrochemical trait of urea is similar to that of ammonium carbonate, and it also causes ammonia volatilization loss.
Reporter: So what are the ways of applying urea? What should I pay attention to?
Expert: Urea's farmland application method can be applied as base fertilizer and top dressing and is not suitable for seed fertilizer. Urea should pay attention to two points when applying base fertilizer. The first application should be deep application of soil. Do not immediately irrigate the water after application to prevent urea from leaching to the deep layer. The application of urea as a base fertilizer on dry land must be applied to the soil to a certain depth, especially on the slightly alkaline calcareous soil. If urea is applied, the loss of ammonia volatilization may be more serious than that of ammonium bicarbonate. The second application amount should be carefully calculated, because urea is a high concentration of nitrogen fertilizer, and the application amount of the base fertilizer is generally 8 to 10 kg/mu.
Reporter: Are there any precautions for urea to be used for topdressing?
Expert: When urea is used as top dressing, it can be applied to the root of the crop through the soil, and it is also suitable for foliar application.
When urea is needed for soil application and topdressing during the vigorous period of crops, pay attention to the application of fertilizers in the early stage than the quick-acting nitrogen fertilizers such as ammonium sulfate and ammonium bicarbonate. How many days in advance depends on the season and temperature, in the early Spring (low temperature 10 degrees) 6 to 8 days in advance, 3 to 4 days in advance in late spring and early summer (16 to 20 degrees), and 1 to 2 days in advance in summer.
Urea is used as top dressing for roots and is suitable for foliar application of various crops. The suitable concentration is generally between 0.1% and 0.5%, depending on the crop type and growth period. When urea is applied to the foliar surface, it must be noted that the content of the subcomponent biuret must be less than 0.5%. In addition, urea and potassium dihydrogen phosphate mixed solution for root dressing, sprayed on the leaves of crops such as wheat or corn, is conducive to their grain filling to increase 1000-grain weight. The urea contained in the foliar fertilizer is beneficial to the absorption of phosphorus and potassium.
Urea is not suitable as a seed fertilizer.
Expert tips:
When urea is used as the base fertilizer, it is necessary to control the amount and pay attention to burying it in the soil.
When urea is used as top dressing, it should be fertilized in advance as appropriate. Urea is not suitable as a seed fertilizer.
Expert: Urea is the largest variety of nitrogen fertilizer, and its main advantages and disadvantages are:
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