First, it is not appropriate to mix or apply with alkaline fertilizers. Urea can not be mixed with lime, ash, calcium magnesium phosphate fertilizer or other alkaline fertilizers or applied simultaneously. In general, in summer and autumn, urea and alkaline fertilizers should be staggered for 3 to 4 days, and winter and spring should be staggered for 7 to 8 days. Second, it is not suitable for seed dressing Urea produces a small amount of biuret during the production process. When the biuret content exceeds 2%, it will poison the seeds and seedlings, affecting seed germination and seedling growth. Third, it should not apply immediately after irrigation If water is applied immediately after application or dry land is applied before heavy rain, urea will be dissolved in water and lost. Generally summer and autumn should be 2 to 3 days after application to irrigation, winter and spring season should be watered after 7 to 8 days after application. Fourth, not suitable for surface application Urea at room temperature requires 4 to 5 days of conversion before it can be used. If applied to the surface, most of them evaporate during the ammoniation process. The actual utilization rate is only about 30%. If applied in soils with high levels of alkaline soils and organic matter, nitrogen loss will be faster. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. Fifth, it should not be used too late The application of urea too late is not conducive to the exertion of the fertilizer effect, and it is easy to cause the crop to become greedy green later, so it should generally be applied 4 to 7 days earlier than other nitrogen fertilizers. Foot Protective Shoes,Leather Safety Shoes,Smash Proof Work Shoes,High Cut Safety Boots Dongying Hong Xing Labor Protection Products Co.,Ltd. , https://www.hongxinglabor.com