Apply urea to guard against six misunderstandings

Urea contains 46% nitrogen, which is a high-quality chemical nitrogen fertilizer used in rural areas. According to the author's understanding, some farmers' friends are still not clear about the nature of urea. There are six major misunderstandings in use:

Misunderstanding - Urea and ammonium bicarbonate mixed with urea after being applied to the soil, it must be 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 carbonate is alkaline after being applied to the soil, and the pH is 8.2 to 8.4. If the mixed application of ammonium bicarbonate and urea in the field, the rate of conversion of urea into ammonia will be greatly slowed down, and urea loss will easily occur. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.

Mistakes in the second surface of the ground, if the urea is applied to the surface, it usually takes 4 to 5 days to convert to the crop at room temperature, but most of the nitrogen is easily volatilized during the ammoniumification process, so the utilization rate is only 30%. about. If applied on alkaline soils and soils with high organic matter content, the loss of nitrogen is faster and more. Therefore, nitrogen cannot be applied on the surface.

Misunderstanding three urea as a seed fertilizer urea often produces a small amount of biuret in the production process, and biuret content of more than 2% will be toxic to seeds and seedlings. In addition, urea enters seeds and seedlings, which also denatures proteins, affecting seed germination and seedling growth.

Misunderstanding four applications of urea immediately after irrigation or drainage of urea is an amine nitrogen fertilizer, after application must be converted into ammonia nitrogen in order to be absorbed and utilized by the crop, the conversion process due to different soil, water and temperature conditions, time is long and short, generally through 2 to 10 days to complete. If the urea is filled or drained immediately after application, the urea will dissolve in the water and be lost.

Misunderstanding five urea and alkaline fertilizer mixed application of urea must be converted into ammonia nitrogen to be used by crops, while ammonia nitrogen under alkaline conditions, most of the nitrogen will become ammonia gas volatilization, so urea can not be with lime Alkaline fertilizers such as plant ash, calcium magnesium phosphate, etc. are mixed or applied simultaneously.

Misunderstanding six urea applied to celery on the celery during the entire growth period need to apply a large amount of nitrogen fertilizer, but not urea. Because the application of urea, it will lead to increased celery fiber, plant aging, slow growth, and bitter taste, poor quality. Celery is suitable for the application of ammonium bicarbonate, ammonia and organic fertilizers.

(Henan Agricultural Vocational College Li Dagang)

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