Urea has many uses, besides being known as chemical fertilizer, there are also some daily uses, such as ointment sold in pharmacies, putty powder for painting walls during decoration, etc., but the main use is to be used as fertilizer in the field. As a fertilizer, urea can be used as compound fertilizer, irrigation fertilizer, water-soluble fertilizer and foliar fertilizer.Although urea has many uses, it is also widely known to farmers, but Xiaobian still wants to talk about the advantages and disadvantages of urea here, so that everyone can be psychologically prepared when using it.(1) Advantages of urea:1. The nitrogen content is high. The nitrogen content of urea produced by regular manufacturers is about 45%~46.4%, which is the fertilizer with the highest nitrogen content except liquid ammonia, but liquid nitrogen is not suitable for agricultural production because it is rare and easy to evaporate. .2. Urea is a neutral fertilizer, which has little harm to soil and generally does not cause soil hardening or acidification and alkalization; Moreover, urea has strong miscibility, and it is generally no problem to mix with other fertilizers and pesticides.3. The absorption of urea is fast. After spraying urea on leaves, it can be completely absorbed in about 1~2 days. If it is applied to the ground as a fertilizer, urea will be transformed quickly at high temperature and can be absorbed in about 2~7 days. If the temperature is low, it will take about 7~10 days.(II) Disadvantages of urea:1. During the production of urea, a substance called biuret will be produced. If its content is too high, it will have adverse effects on the growth and development of crops, such as burning roots, burning leaves, inhibiting germination, etc. Therefore, the content of biuret in regular urea is generally below 2%.2. When urea is dissolved, it will absorb some heat. If urea is used in greenhouses in winter, attention should be paid to it. After urea is applied, temperature increase measures should be taken, otherwise the low temperature will drop and the roots will easily catch cold, which will affect the growth of crops.3. Urea does not need to be applied to the ground. It needs a certain transformation time, and it takes 1~2 days to be absorbed by crops except spraying on leaves.