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Misunderstanding 2: The ground is spread. Urea is applied to the surface, and it can be absorbed by the crop after 4 days to 5 days at room temperature. Most of the nitrogen is volatilized during the ammoniumification process, and the utilization rate is only about 30%. If it is in alkaline soil and organic matter content. High soil application, nitrogen loss is faster and more. Therefore, nitrogen cannot be applied to the surface.
Misunderstanding 3: Urea is used as a seed fertilizer. Urea often produces small amounts of biuret during the production process. If the biuret content exceeds 2%, it will be toxic to seeds and seedlings. When urea enters seeds and seedlings, it denatures proteins, affecting seed germination and seedling growth.
Misunderstanding 4: Immediately after applying urea. Urea is an amine nitrogen fertilizer, which must be converted into ammonia nitrogen after application to be absorbed and utilized by crops. The transformation process is different due to different conditions such as soil quality, moisture and temperature. The time is long and short. It usually takes 2 days to 10 days to complete. If the urea is applied immediately after irrigation or the dry land is applied before heavy rain, the urea will dissolve in water. Loss.
Misunderstanding 5: Urea and alkaline fertilizer mixed application. Urea must be converted to ammonia nitrogen after application to be used by crops. Ammonia nitrogen Under alkaline conditions, most of the nitrogen will become ammonia gas volatilization, so urea can not be mixed with or applied with alkaline fertilizers such as lime, grass ash, calcium magnesium phosphate.
Misunderstanding 6: Urea is applied to celery. During the whole growth period of celery, a large amount of nitrogen fertilizer should be applied, but urea cannot be applied. Because of the application of urea, the celery fiber is thicker and thicker, the plant is aging, the growth is slow, and the taste is bitter and the quality is inferior. Celery is suitable for the application of ammonium bicarbonate, ammonia and organic fertilizers, which is beneficial to improve quality.
Public Network - Rural Volkswagen
Six major misunderstandings of urea application
Urea contains 46% nitrogen, which is a high-quality chemical nitrogen fertilizer used in rural areas. According to the author's understanding, some farmers' friends are still not clear about the nature of urea. There are still six major misunderstandings in use. Misunderstanding 1: Urea mixed with ammonium bicarbonate. Since urea is applied to the soil, it is converted into ammonia to be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. After the ammonium carbide is applied to the soil, it has an alkaline reaction with a pH of 8.2 to 8.4. Mixed application of ammonium bicarbonate and urea in farmland will greatly reduce the rate of conversion of urea into ammonia, which will easily lead to loss of urea and loss of volatilization. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
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