Precautions for applying urea
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Urea is applied to the surface, and it takes 3 to 5 days to convert at room temperature to be absorbed by the crop. Most of the nitrogen is volatilized during the conversion of urea to ammonium. The utilization rate is only 30%. If it is applied in alkaline soil. The loss of nitrogen is more and faster. Therefore, when farmers apply urea, they can't save their work and spread the fertilizer on their surface. In the production process, a small amount of biuret is often produced. If the biuret content exceeds 2%, it will poison the seeds and seedlings, affecting the germination of the seeds and the growth of the seedlings. In severe cases, dead seedlings will be caused.
Urea is an amide nitrogen fertilizer that must be converted to ammonium nitrogen after application to be absorbed and utilized by crops. The conversion process varies in terms of soil quality, moisture and temperature, and the length of time varies from 2 to 10 hours. If water is applied immediately after application, the urea will dissolve in the water and be lost in large amounts.
After being applied with urea, it must be converted into ammonium nitrogen to be absorbed and utilized by crops. Under alkaline conditions, most of the nitrogen will become ammonia gas volatilization. Therefore, urea cannot be mixed with or used with alkaline fertilizers such as lime, grass ash, calcium magnesium phosphate.