Urea is the solid nitrogen fertilizer with the highest nitrogen content. It is not only suitable for the base fertilizer of various crops, but also one of the best fertilizers for top dressing. However, using urea as top dressing is the most taboo to apply water immediately after top dressing.
As we all know, urea is a white granular crystal that is slightly hygroscopic and can completely dissolve in water. It is a neutral fertilizer. No residues remain in the soil after urea application and are referred to as non-auxiliary fertilizers. However, it has a prominent feature that the amide-containing nitrogen contained therein cannot be directly absorbed by crops and must be converted into ammonium nitrogen before it can be utilized through the action of microorganisms in the soil. If urea is used immediately after irrigation, it will be dissolved by water. Due to the weak adsorption force between soil colloid and urea, urea has great mobility in the soil, especially flood irrigation, which will cause urea to leach deeper. Reduce fertilizer efficiency. Therefore, it is not advisable to apply water immediately after topdressing urea. It is even more unscientific to say that fertilizer is applied to urea before rain.
So, how to scientifically apply urea? The first thing to know about the weather is mainly the temperature. Urea at the temperature of 10 °C, the conversion time takes 7-10 days, 20 °C to 4-5 days, 30 °C 2 days can be fully converted into the crop of ammonia. With this in mind, it is possible to determine the irrigation time after top dressing based on the temperature conditions. Second, to understand the soil condition, the fertile soil transforms faster than the infertile soil, and the viscous soil is faster than the sandy soil. Viscous and fertile soil topdressing urea, compared to thin, sandy soil irrigation earlier. Once again, it must be combined with organic fertilizers, because there are many microorganisms in organic fertilizers, which can provide better conditions for urea conversion and accelerate the conversion process. Finally, measures should be taken to deepen the soil and cover soil. This will not only prevent direct evaporation from exposure, but also increase the chance of contact with microorganisms in the soil. This will help the soil colloids absorb urea in the soil and convert it into ammonium carbonate or ammonium bicarbonate. Provide useful nutrients for crops.
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