Urea has a nitrogen content of 46.6%, which is a high-quality chemical fertilizer used in rural areas. Since some farmers' friends are not too aware of the nature of urea, there are often many misunderstandings in the application process. Specifically in the following aspects:
1. Mixed with ammonium carbonate. Because urea is converted into ammonia after being applied to the soil, it can be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. The ammonium carbonate is alkaline reaction after being applied to the soil, which will greatly slow down the conversion of urea, easily cause the loss and volatilization of urea, and reduce the utilization rate of urea. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
2, the ground is applied. 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 even faster. Therefore, when farmers apply urea, they cannot save their work and apply their surface.
3. Used as a seed fertilizer. Urea often produces small amounts of biuret during the production process. 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.
4. Water immediately after application. 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.
5. Mixed with alkaline fertilizer. After the urea is applied, it must be converted into ammonium nitrogen to be absorbed and utilized by the crop. 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.
6. Apply on celery. Celery needs to apply a large amount of nitrogen fertilizer throughout the growing season, but urea cannot be applied. Because after the application of urea, the celery fiber will increase and become thicker, the plant will be aging, the growth will be slow, and the taste will be bitter and the quality will be inferior. It is advisable to use ammonium bicarbonate, ammonia water and organic fertilizer for fertilizing celery, which is conducive to improving quality.
1. Mixed with ammonium carbonate. Because urea is converted into ammonia after being applied to the soil, it can be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. The ammonium carbonate is alkaline reaction after being applied to the soil, which will greatly slow down the conversion of urea, easily cause the loss and volatilization of urea, and reduce the utilization rate of urea. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
2, the ground is applied. 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 even faster. Therefore, when farmers apply urea, they cannot save their work and apply their surface.
3. Used as a seed fertilizer. Urea often produces small amounts of biuret during the production process. 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.
4. Water immediately after application. 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.
5. Mixed with alkaline fertilizer. After the urea is applied, it must be converted into ammonium nitrogen to be absorbed and utilized by the crop. 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.
6. Apply on celery. Celery needs to apply a large amount of nitrogen fertilizer throughout the growing season, but urea cannot be applied. Because after the application of urea, the celery fiber will increase and become thicker, the plant will be aging, the growth will be slow, and the taste will be bitter and the quality will be inferior. It is advisable to use ammonium bicarbonate, ammonia water and organic fertilizer for fertilizing celery, which is conducive to improving quality.
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