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Urea is a chemical nitrogen fertilizer with the largest production volume and the largest amount in my country, and is widely used in the production of various crops. But did you know that The percentage of nitrogen in urea is about? How to master the urea fertilization method and application time? Today we look at related issues.
Characteristics of urea:
Urea is one of the highest nitrogen content of nitrogenous fertilizer, urea as a neutral fertilizer, suitable for all kinds of soil and plants, urea is easy to preserve, easy to use, less damage to the soil, and is a kind of chemical nitrogen fertilizer, the heavy usage of nitrogen and carbon dioxide in a certain industry under the condition of synthesis of urea, urea nitrogen then?
The percentage of nitrogen in urea is about?
The theoretical nitrogen content of urea is 45% to 46%, and the actual nitrogen content will be lower than the theoretical nitrogen content because chemical fertilizers will contain some impurities. Urea contains chemical elements such as carbon, hydrogen, oxygen, nitrogen, etc. It is one of the simplest organic compounds and the main nitrogen-containing final product of protein metabolism and decomposition in mammals and some fishes.
Physical properties of urea:
Urea is easily soluble in water, the aqueous solution is neutral, and the crystalline urea has a white needle-like or prismatic crystal shape, which has strong hygroscopicity and agglomerates after hygroscopicity. Under the action of enzymes, it can be hydrolyzed to generate ammonia and carbon dioxide. Urea can undergo condensation reaction at high temperature to generate biuret, triuret and cyanuric acid. It is named urea because it is contained in human urine. The nitrogen content of urea is about 46.7%, which is the highest among solid nitrogen fertilizers.
In medicine, the skin can contain certain agents of urea to increase the humidity of the skin, and urea is used to make ammonia, thereby increasing the pH value in the stomach; in agriculture, urea is a neutral fast-acting fertilizer and can also be used to produce a variety of Compound fertilizer does not leave any harmful substances in the soil, and it has no adverse effects in long-term use.
How is urea administered?
1. Urea is suitable for all crops and all kinds of soil. It can be used as base fertilizer and topdressing. Urea is used as base fertilizer. Generally, 10cm trench is dug on the planting soil and buried in the soil. About 15-20kg is applied to field crops per mu.
2. The effect of urea as top dressing outside the root (foliar spray) is better than other nitrogen fertilizers. The concentration of urea as top dressing outside the root is generally 1% for crops. Choose to spray in the morning or evening for better results.