Correct application of urea

Correct application of urea

Urea is the most common and most commonly used nitrogen fertilizer in agricultural production. It has high nitrogen content, stable physical properties, and is not volatile and is very popular among farmers. However, in production practice, it is found that some farmers' friends still have some unscientific and unreasonable points in their use. Enumerating here will help farmers' friends.
1. Immediately after application, some farmers watered the urea immediately after applying urea, thinking that this would speed up the dissolution of urea and make the crops quickly available. 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. Spreading on the surface and not covering the soil after the application Some peasants want to facilitate the map, save time, or think that the urea is stable and not volatile. When the fertilizer is applied, the ditch is shallower or not even open at all, and the sewers may be applied along with the sewer or surface. It is an extremely erroneous practice to let it be exposed to the surface of the soil. This fertilizer will cause 100% volatilization of the fertilizer to be lost, which is basically equivalent to not top-dressing, and it also consumes human, financial and material resources. This is because urea is stable and not volatile, but 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.
The correct and safe method of application of urea is: Select a recent sunny 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 in summer to re-irrigation; in winter, it is re-irrigated every 6-8 days to ensure fertilizer efficiency.

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