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Urea contains a substance called "biuret." If biuret content is too high in the soil, it will affect the germination of crop seeds and inhibit the growth of young shoots and young roots. Therefore, urea is not suitable for seed fertilizers. Can do base fertilizer. Urea as top-dressing should pay attention to its decomposition in the soil. There is a process, usually about 7 days, it should be used as topdressing, such as foliar spray, generally below 3 g/l is relatively safe. In the application of urea, it should be noted that with the use of open bags, if there are unfilled urea in the bag, the bag should be immediately tied to prevent the formation of water.