Urea is one of the most important chemical fertilizers for increasing crop yield. However, there are many unreasonable phenomena in the application process. These unsuitable application methods not only cause unnecessary waste, but also seriously pollute the agricultural environment and groundwater resources. Therefore, the following five aspects should be noted when making urea:
1. Urea is 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.
2, the ground is applied. 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.
3, urea 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.
4. Immediately after applying urea, water is applied. 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. .
5. Immediately after applying urea, water is applied. 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. .
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