What should we pay attention to when spraying urea?

What should I pay attention to when spraying urea? Please introduce spraying urea should pay attention to: first, do not spray before hot weather or rain, so as to avoid burning seedlings or loss of fertilizer. It is appropriate to spray every morning or afternoon, and spray again every 7-10 days. Second, when spraying cereal crops or crops with smooth leaves, 0.1% adhesive (such as washing powder, cleaning) should be added. Otherwise, the effect is not good. Third, for urea used for spraying, the content of biuret should not be higher than 0.5%, and it is easy to damage leaves when topdressing with high content. Fourth, different types of crops require different concentrations of urea solution to be sprayed. In general, cereal crops require a spray concentration of 1.5%-2%, and the concentration is even lower when spraying at flowering stage. The spraying concentration of leafy vegetables and cucumbers is 1%-1.5%. Click to get more nitrogen, phosphorus, potassium application techniques click to get more fertilizer application techniques