Second, the surface spread of urea spread on the surface, at room temperature to go through 3 to 5 days of transformation process can be absorbed by the crop, most of the nitrogen in the conversion of urea into ammonium is volatilized, the utilization rate is only about 30%; In the alkaline soil application, the loss of nitrogen is faster and more. Therefore, urea cannot be spread on the surface. Third, as fertilizer urea in the production process, will produce a small amount of biuret. When the biuret content exceeds 2%, the seeds and seedlings are poisoned. Urea enters seeds and seedlings and denatures proteins, affecting seed germination and seedling growth. IV. Immediately after applying urea, urea-amide nitrogen fertilizer should be applied. After application, it must be converted into ammonium nitrogen before it can be absorbed and utilized. The process of conversion depends on the conditions of soil quality, moisture, and temperature. 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. . Fifth, with the application of alkaline fertilizer ammonium nitrogen in alkaline conditions, most of the nitrogen will become volatile ammonia. Therefore, urea can not be mixed with lime, grass ash, calcium magnesium phosphate fertilizer and other alkaline fertilizers or used simultaneously. Six, on the celery celery on the whole growth period requires a lot of nitrogen, but not urea. Because of the topdressing of urea, the celery fiber will become thicker and thicker, the plants will age, grow slowly, and the food will have a bitter taste, resulting in poor quality. Celery is suitable for applying ammonium bicarbonate, ammonia, and organic fertilizers.
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Application of urea out of the six errors
First, with ammonium bicarbonate mixed with urea into the soil, to be converted into ammonium nitrogen can be absorbed by the crop, and its conversion rate under alkaline conditions is much slower than under acidic conditions. After applying ammonium bicarbonate, the soil showed a basic reaction. If ammonium bicarbonate and urea are mixed, the rate of conversion of urea to ammonia will be greatly slowed, which will easily lead to the loss of urea and loss of volatilization. Therefore, the two should not be mixed or applied at the same time.