Urea is the most common and most commonly used nitrogen fertilizer in agricultural production. Because of its high nitrogen content, stable physical properties and low volatility, urea is very popular among farmers. However, in production practice, it is found that some farmers' friends still have some misunderstandings in their use. The author lists it here, hoping that farmers' friends can correct it and let urea give full play to its role in promoting crop yield increase.

First, the use of errors

1, water immediately after application. Some farmers immediately performed watering after applying urea, thinking that this would speed up the dissolution of urea and allow the crop to absorb quickly. In fact, it is not so, because urea can not be directly absorbed and utilized by crops, it needs to be converted into ammonium carbonate before it can be absorbed and utilized by crops. After the urea is applied to the soil, it is present in the soil in a molecular state, and is easily lost to water before it is converted into ammonium carbonate for absorption and utilization by the crop. If water is applied immediately after application, urea will be lost with water or infiltrated with water into the deep layer of the soil and cannot be absorbed or utilized by crops, resulting in fertilizer loss and waste.

2, the surface of the spread, after the application is not buried. Some peasants have to be convenient, save trouble, or think that urea is stable and not volatile. When the topdressing is done, the ditch is shallow or not even open at all. After the topdressing or surface applicator is applied along with the ditch, it will not cover soil after being chased and allowed to expose to the soil. On the surface, this is an extremely erroneous practice, so that topdressing will cause 100% of the fertilizer to lose its volatility, which is basically the same as not top-dressing, and it also consumes human, financial and material resources. Although urea is stable and not volatile, it will quickly lose its volatility after being converted into ammonium carbonate under the action of soil microorganisms, but it will only take a little longer than ammonium bicarbonate.

Second, the correct use of methods

The correct and safe application method of urea is: choose the recent sunny and sunny weather, open ditch or open a deep hole, the depth of 7-10 cm is appropriate, after the application of strict casing. After topdressing urea, it takes 2-3 days for summer to re-irrigation; in winter, it is re-irrigated every 6-8 days to ensure fertilizer efficiency.

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