Urea is indeed a fertilizer and at the same time an organic compound.
Urea is an important nitrogen fertilizer in agricultural production, which can provide the nitrogen required by plants, promote the growth of cells, and make branches and leaves grow luxuriantly. At the same time, urea can usually reach 40-50% utilization rate after being applied to the soil, so it is a cost-effective fertilizer. It can be used as basal fertilizer, top dressing and extra-root top dressing. In addition, urea can also increase the protein content and amino acid content of crops, improving the quality of crops.
Urea is a common fertilizer, which is an organic compound composed of three elements: carbon, nitrogen, and oxygen. It has the chemical formula CO(NH2)2 and a molecular weight of 6006。Urea is widely used in agriculture because it provides the nitrogen needed by plants to promote their growth and development.
The composition of urea mainly includes three elements: carbon, nitrogen, and oxygen. Among them, carbon and oxygen are the main elements that make up the urea molecule, which respectively occupy 467% and 355%。Nitrogen is another important component of the urea molecule, accounting for 178%。In addition, urea also contains small amounts of hydrogen, sulfur and other elements.
After being hydrolyzed in the soil, urea is mainly converted into ammonium carbonate, which can be quickly absorbed and utilized by plants due to its fast-acting properties. At the same time, urea is also a high-concentration nitrogen fertilizer, which is a neutral fast-acting fertilizer, and long-term use will not have adverse effects on soil or plants.
Urea
However, it is important to note that while urea can provide plants with a large amount of nitrogen and help promote plant growth and development, excessive use may cause harm to plants. For example, when the concentration of urea in the soil is too high, it will cause the soil pH value to rise by 2-3 units, and the urea itself also contains a certain amount of biuret, which will have an inhibitory effect on the young roots and young shoots of crops at a concentration of 500 ppm. Therefore, when using urea as fertilizer, the dosage should be properly controlled to avoid unnecessary damage to plants.
The use of urea is very simple. In general, urea can be sprinkled directly on the soil surface or mixed into the soil. There are a few things to keep in mind when using urea:
1.Timing selection: The timing of urea should be determined based on the growth cycle of the crop and the time when nitrogen fertilizer is required. In general, spring and autumn are the best times to use urea.
2.Dosage control: When using urea, it is necessary to pay attention to the control of dosage, excessive use will lead to the rapid growth of plants, affecting quality and yield. Generally speaking, the amount of urea used per acre of land should be between 20-30 kg.
3.Uniform application: When using urea, it needs to be evenly sprinkled on the soil surface or mixed into the soil to avoid local excess or insufficiency.
4.Use with other fertilizers: Urea can be used with other fertilizers, such as phosphate fertilizer, potassium fertilizer, etc., to improve the effect and utilization rate of fertilizers.
5.Balanced fertilization: Since urea only contains nitrogen and does not contain a large number of elements necessary for crop growth, such as phosphorus and potassium, the application of urea should be combined with the results of soil testing and testing, and the formula fertilization technology should be used to apply nitrogen, phosphorus and potassium fertilizers in a balanced manner.
When choosing urea, there are several factors to consider:
1.Purity and quality of urea: High-quality urea should have high purity and low insoluble matter content, which can prevent problems such as clogging the nozzle.
2.Particle size: The urea of small particles has good solubility, can dissolve and play a role in the soil faster, and is suitable for pre-mating and foliar sprayingAlthough the effect of large granular urea is slow, the fertilizer effect period is longer, and it is more suitable for use as a base fertilizer.
3.Production date and storage conditions: Choose urea that is close to the production date, because urea is prone to spoilage if left for a long time or exposed to the sun.
4.* The ** of the car urea solution is generally about 3 yuan liters, if the ** is too low, you need to be alert to quality problems.
In conclusion, urea is an important fertilizer that provides the nitrogen needed by plants to promote their growth and development. When using urea, it is necessary to pay attention to the control of the dosage, the selection of time and the uniform application to achieve the best fertilization effect.