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The correct use of urea is ditch application or acupoint application: ditch or open hole application, the ditch (hole) is 7-10 cm deep, and the soil is covered immediately after application, so that urea is closely combined with the soil and is not exposed to the surface. Thoroughly change the practice of surface application and improve utilization. Some farmers in the production also apply ditch when applying urea, but the ditch is shallow, the covering soil is not fine, and some even spread it evenly, so that the urea is exposed to the surface. It is considered that the physical properties of urea are relatively stable and are not easily lost, but I don’t know Under the action of soil microbes, it will also be lost like ammonium carbonate. It’s only a little later
It is not advisable to irrigate the crop immediately after applying urea
After the application of urea, the crop cannot be filled immediately. The reason is: urea is an amine nitrogen fertilizer, which must be converted into ammonia nitrogen after application to be absorbed and utilized by the crop. The conversion process is different due to different soil, water and temperature conditions. The time is long and short. It usually takes 2-10 days to complete. If the urea is applied immediately after application or the dry land is applied before heavy rain, the urea will be dissolved in water and lost.
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