Urea is the solid nitrogen fertilizer with the highest nitrogen content. It is not only suitable for the bottom fertilizer of various crops, but also one of the best fertilizers for top dressing. However, it is most difficult to use urea as a top dressing.
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Urea is a white granular crystal that is slightly hygroscopic and can be completely dissolved in water. It is a neutral fertilizer. Where administration without any urea residue was left in the soil, the fertilizer is called no side component. However, it has a prominent feature that the guanamine-containing nitrogen cannot be directly absorbed by the crop and must be converted into ammonium nitrogen by the action of microorganisms in the soil before it can be utilized. If the water is applied immediately after urea application, it will be dissolved by water. Because the adsorption between the soil colloid and urea is very weak, the fluidity of urea in the soil is very large, especially the flooding of large water, which will cause the urea to drip into the deep layer. Reduce fertilizer efficiency. Therefore, it is not advisable to fill the water immediately after applying urea. It is even more unscientific to say that the fertilizer is applied to the fertilizer before the rain.
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At a temperature of 10 °C, urea requires 7-10 days for conversion , 4-5 days at 20 ° C, and 2 days for conversion to ammonia required for crops at 30 °C . With this in mind, it is possible to determine the irrigation time after topdressing based on the temperature conditions.
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Secondly, it is necessary to understand the soil conditions. The fertile soil transforms faster than the thin soil, and the clay soil is faster than the sandy soil. After applying urea to viscous and fertile soil, it can be pre-filled with thinner and sandy soil. Once again, it should be combined with organic fertilizers, because there are many microorganisms in organic fertilizer, which can provide better conditions for urea conversion and accelerate the transformation process.
Finally, the method of deep application and covering soil should be adopted, so as to avoid the direct volatilization of the exposed, and increase the chance of contact with the microorganisms in the soil, which is beneficial to the adsorption of the urea in the soil by the colloid of the soil colloid, or the ammonium bicarbonate. Provide useful nutrients to crops.
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