Easy storage, convenient use and little damage to soil. It is a chemical nitrogen fertilizer with large usage and the highest nitrogen content. Urea is synthesized from ammonia and carbon dioxide in industry under certain conditions. Urea is easily soluble in water, and 105g is soluble in 100 ml water at 20℃, and the aqueous solution is neutral. There are two kinds of urea products.
Application in agriculture:
Urea is a kind of high concentration nitrogen fertilizer, which belongs to neutral quick-acting fertilizer and can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and long-term application has no adverse effects. Animal husbandry can be used as feed for ruminants. However, when the granulation temperature is too high, a small amount of biuret, also known as biuret, will be produced, which will inhibit crops. China stipulates that the biuret content of urea for fertilizer should be less than 0.5%.
When the biuret content exceeds 1%, it cannot be used as seed fertilizer, seedling fertilizer and foliar fertilizer, and the urea content in other application periods should not be too high or too concentrated.
Refer to the above content: Baidu Encyclopedia-Urea