Applying urea is stressful
Cannot be mixed with ammonium bicarbonate After being applied to the soil, urea is converted into ammonia to be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. When ammonium bicarbonate is applied to the soil and is alkaline, the rate of conversion of urea into ammonia is greatly slowed down, which easily causes loss of loss and volatilization. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
Urea can not be applied to the surface and applied to the surface. It can be absorbed by the crop after 4-5 days of transformation at room temperature. Most of the nitrogen is volatilized during the ammoniation process, and the utilization rate is only about 30%. Nitrogen loss is faster and more if applied to the surface of alkaline soils and soils with high organic matter content. Therefore, urea cannot be applied to the surface.
Avoid using seed fertilizers When using urea as a seed fertilizer, a small amount of biuret is often produced during the conversion process. If the biuret content exceeds 2%, it will be toxic to seeds and seedlings.
Can not be mixed with alkaline fertilizer after application of urea must be converted into ammonia nitrogen in order to be used by crops. Under alkaline conditions, most of the nitrogen in ammonia nitrogen will become ammonia gas, so urea can not be mixed with lime. Alkaline fertilizers such as plant ash, calcium magnesium phosphate, etc. are mixed or applied simultaneously.
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