Urea is a white granular crystal, 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 appropriate to apply water immediately after urea is applied, and it is even more unscientific to apply topdressing fertilizer before rain.
In combination with organic fertilizers, there are many microorganisms in organic fertilizers, which can provide better conditions for urea conversion and accelerate the conversion process.
Deep application of soil and promotion of nutrient release can not only prevent direct direct evaporation, but also increase opportunities for contact with microorganisms in the soil. It is beneficial for soil colloids to adsorb urea in the soil to decompose and convert ammonium carbonate or heavy ammonium carbonate, providing crops with Useful nutrients.
Irrigation time based on temperature Determination of urea At a temperature of 10°C, the conversion time takes 7 to 10 days, 20 to 4 to 5 days, and at 30°C, it can be converted into ammonia required by the crop in two days. With this in mind, it is possible to determine the irrigation time after top dressing based on the temperature conditions.
Different soils have different irrigation time 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.
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