1, urea should be deep. This is conducive to the conversion of urea, but also reduce the volatilization loss after urea conversion of ammonium carbonate, can not be too close to the root system when applied, in order to prevent ammonia damage burning seedlings.
2. When urea is used as top dressing for rice, taking into account the characteristics of large initial fluidity, irrigation is not performed immediately after application, and water is refilled when it is converted into ammonia nitrogen several days later.
3. Do not use urea excessively to cause loss in sandy soil. It should be applied flexibly according to the principle of “eat less mealsâ€.
4, to use in advance than other nitrogen fertilizers. Because urea is a kind of organic compound with low molecular weight, it must have an ammoniated process after it is applied to the soil, and it can be converted into a highly volatile ammonium carbonate before it can be absorbed by the roots of the crop. Therefore, when urea is used as top dressing, Apply about 7 days earlier than other nitrogen fertilizers.
5. Do not mix with alkaline fertilizers. Because urea is a neutral fertilizer, if mixed with alkaline fertilizer, it is easy to reduce the effect of fertilizer. If used alternately, it must be staggered for 3-5 days.
6, should not immediately apply water after fertilization. After urea is applied to the soil, it cannot be absorbed by the soil before it is converted and transformed. If you apply water immediately after dressing, it will cause a large loss of urea. Soil water shortage, non-irrigation can not be time, but also to do a small water pouring, avoid flooding.
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