1. For cereal crops, the spraying concentration is 1.5-2%, that is, 1.5kg-2kg urea particles are added to the clean water with the water volume of 100kg. When spraying at flowering stage, the concentration of urea should be lower. The fertilizer liquid can be sprayed on 5 mu of land (15-20 kg of water per mu of land).
2. The spraying concentration of leafy vegetables, such as vegetables and cucumbers, is 1-1.5%. That is, add 1 kg -1.5 kg urea particles into 100 kg of clean water.
3. Fruit trees, apple, pear, grape and other fruit trees should be 0.5%. That is, add 0.5 kg urea fertilizer to 100 kg of clean water, dissolve and stir fully.
4. For Eggplant and fruit, the spraying concentration is 0.3%, i.e. 100kg of water is mixed with 0.3KG of urea.
Although urea is good, it is not a special foliar fertilizer. It is easy to burn seedlings when sprayed on the foliar surface. In addition, the correct use of urea is hole application. Spraying can not achieve the desired effect. When spraying on the foliar surface, special liquid nitrogen fertilizer is selected to replace urea topdressing. The cost is not high, and the effect is much better than that of urea.
