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There are six taboos for applying urea
One avoid mixing with ammonium bicarbonate. After urea is applied to the soil, it must be converted into ammonia to be absorbed by the crop. The conversion rate is much slower under alkaline conditions than under acidic conditions. After the 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. Second bogey surface to spread. Urea is applied to the surface of the earth. At room temperature, it takes 4 to 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. Three bogey for 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. Four bogey water immediately after application. Urea is an ammonia 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 time to time. It generally takes 2 to 10 days to complete. If urea is applied immediately after irrigation or dry land is applied before heavy rain, urea will dissolve in water and be lost. . Five bogey and alkaline fertilizer mixed application. After urea is applied, it must be converted into ammonia nitrogen before it can be used by crops. Under alkaline conditions, most of the nitrogen in the ammonia nitrogen will evaporate. Therefore, urea cannot be mixed with lime, grass ash, calcium magnesium phosphate, and other alkaline fertilizers or applied at the same time. Six bogey on celery. During the entire growth of celery, a large amount of nitrogen fertilizer should be applied, but no urea should be applied. Because of the topdressing of urea, the celery fiber becomes thicker, the plants are aging, and the growth is slow, and the consumption is bitter and the quality is poor. The celery is suitable for applying ammonium bicarbonate, ammonia, and organic fertilizers to improve quality.