What should I pay attention to when spraying urea?

What should I pay attention to when spraying urea? Ask friends to help introduce in the process of going to the countryside, often see farmers spray urea on vegetables, farming network sorted out a few points that need to be noticed when spraying urea, listed below for netizens' reference. Pay attention to one, do not spray before hot weather or rain, so as not to burn seedlings or lose fertilizer. It is appropriate to spray every morning or afternoon, and spray again every 7-10 days. Note 2. When spraying cereal crops or crops with smooth leaves, 0.1% adhesive should be added, otherwise, the effect will not be good. Note that the urea used for spraying, the content of biuret should not be higher than 0.5%, otherwise it is easy to damage the leaves. Note 4, different types of crops, the concentration of urea solution required to be sprayed is also different, general cereal crops require spraying concentration of 1.5-2%, in the flowering period, the concentration should be a little lower. The spraying concentration of leafy vegetables and cucumbers is 1-1.5%, and that of tomatoes is 0.3%. 0.5% is suitable for fruit trees such as apples, pears and grapes. Click to get more vegetable planting techniques click to get more foliar fertilizer application methods click to get more fertilizer application methods