Urea is one of the most important chemical fertilizers for increasing crop yield. However, many irrational phenomena exist in the process of application by farmers. These unsuitable application methods not only cause many unnecessary wastes, but also seriously pollute the agricultural environment and groundwater resources. Therefore, in the use of urea should pay attention to the following five areas of misunderstanding: 1, urea and ammonium bicarbonate mixed. Since urea is applied to the soil, it must be converted into ammonia before it can be absorbed by the crop. The conversion rate is much slower under alkaline conditions than under acidic conditions. After ammonium bicarbonate was applied to the soil, the reaction was alkaline and the pH was 8.2-8.4. Mixed application of ammonium bicarbonate and urea in farmland will greatly reduce the rate of conversion of urea to ammonia, which will easily lead to loss of urea and loss of volatiles. Therefore, urea and ammonium bicarbonate should not be mixed or applied simultaneously. 2. Surface spread. Urea is applied to the surface of the earth. At room temperature, it takes 4-5 days for transformation to be absorbed by the crop. Most of the nitrogen is volatilized during the ammonium process. The utilization rate is only about 30%. If the alkaline soil and organic matter are high The application of soil, nitrogen loss faster and more. Therefore, nitrogen cannot be spread on the surface. 3, urea as a fertilizer. In the production process, urea often produces a small amount of biuret. Biuret content of more than 2% will poison seeds and seedlings. Urea enters seeds and seedlings and denatures proteins, affecting seed germination and seedling growth. 4, irrigation immediately after applying urea. Urea is an amine nitrogen fertilizer that must be converted to ammonia nitrogen before it can be absorbed and utilized by crops. The conversion process depends on the conditions of soil quality, moisture, temperature, etc. The time varies from 2 to 10 days. If urea is applied immediately after irrigation or dry land is applied before heavy rain, urea will dissolve in water and be lost. . 5. Apply water immediately after applying urea. Urea is an amine nitrogen fertilizer that must be converted to ammonia nitrogen before it can be absorbed and utilized by crops. The conversion process depends on the conditions of soil quality, moisture, temperature, etc. The time varies from 2 to 10 days. If urea is applied immediately after irrigation or dry land is applied before heavy rain, urea will dissolve in water and be lost. .
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