Method for improving urea fertilizer efficiency

1, urea should be applied deep. This is beneficial to the conversion of urea, and can reduce the volatilization loss after the conversion of urea to ammonium carbonate. It should not be too close to the root system during application to prevent ammonia damage.

2. When urea is used as rice top dressing, considering the characteristics of large initial fluidity, it is not immediately irrigated after application, and is refilled when converted to ammonia nitrogen in a few days.

3. Do not apply excessive urea to the soil on the sandy soil to cause loss. It should be applied flexibly according to the principle of “eat less meals”.

4. Use it earlier than Other nitrogen fertilizers. Because urea is a low-molecular organic compound, it must be ammoniated after being applied to the soil. It can be absorbed into the roots of crops after it is converted into a highly volatile ammonium carbonate. Therefore, when urea is used as top dressing, It was applied about 7 days earlier than other nitrogen fertilizers.

5, should not be mixed with alkaline fertilizer. Because urea is a neutral fertilizer, if mixed with alkaline fertilizer, it is easy to reduce fertilizer efficiency. If it is applied alternately, it should be staggered for 3-5 days.

6. It is not advisable to irrigate immediately after fertilization. After urea is applied to the soil, it cannot be adsorbed by the soil before it is decomposed and converted. If the water is poured immediately after topdressing, it will cause a large loss of urea. Soil water shortage is serious, non-irrigation is not time, but also to do small water and water, avoid large flood irrigation.

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