Urea is an amide nitrogen fertilizer. After being applied to the soil, except for a small portion that is directly absorbed and utilized by crops, most of it is converted into ammonium carbonate under the action of urease in the soil and then is used for crop absorption; the chemical nature of ammonium carbonate is very unstable and easy to distinguish. Explain the release of ammonia. The application of urea to the surface can also cause the volatilization of ammonia. If applied to the surface of calcareous soil or alkaline soil, the volatilization of ammonia is more serious. In addition, urea can not be absorbed by the soil before it is converted into ammonium carbonate. If flood irrigation is conducted immediately after fertilization, urea will be leached to a deep layer to reduce fertilizer efficiency.
Urea is applied in dry land. Whether it is used as base fertilizer or as top dressing, attention should be paid to deep application of cover soil so that the fertilizer is placed in a moist soil layer to facilitate the conversion of urea and prevent the volatilization of ammonia after conversion; if the soil moisture content is insufficient after fertilization, Water can be appropriate, avoid flooding irrigation. Paddy field should be applied before irrigation, it is best to deepen, generally do not rush to irrigation after application, need to be irrigated every 3-5 days.
Urea is applied in dry land. Whether it is used as base fertilizer or as top dressing, attention should be paid to deep application of cover soil so that the fertilizer is placed in a moist soil layer to facilitate the conversion of urea and prevent the volatilization of ammonia after conversion; if the soil moisture content is insufficient after fertilization, Water can be appropriate, avoid flooding irrigation. Paddy field should be applied before irrigation, it is best to deepen, generally do not rush to irrigation after application, need to be irrigated every 3-5 days.
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