Common misunderstandings during the use of urea
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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. The ammonium carboxamide is alkaline after being applied to the soil, and has a pH of 8.2-8.4. 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.
Misunderstanding 2: The ground is spread. Urea is applied to the surface, and it can be absorbed by the crop after 4-5 days of transformation at room temperature. Most of the nitrogen is volatilized during the ammoniumification process, and the utilization rate is only about 30%, if it is high in alkaline soil and organic matter. The soil is applied and the loss of nitrogen is much faster. 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 conversion process is different due to different conditions such as soil quality, moisture and temperature. The time is long and short. It usually takes 2-10 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 and be lost. .
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.
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