Scientific experiments have proved that in general farmland, soil temperature is the main influencing factor of urea conversion rate when soil moisture and pH are basically suitable for the normal growth of crops. For example, in the early spring when winter wheat is returned to the green season, the ground temperature is about 10°C, and it takes about 7 to 10 days for the conversion of urea nitrogen to ammonium nitrogen; when the temperature rises to 20°C, the spring corn is used as a fertilizer during the bell-mouth stage and when the wheat is fertilized at the booting stage. It takes about 5 days for urea to convert to ammonium nitrogen, but it only takes 3 days for the local temperature to rise to 25°C. Therefore, the use of urea fertilizer is better than other ammonium nitrogen fertilizers for a few days in advance. As for the specific days in advance, it is necessary to adjust to local conditions.
When urea is used as topdressing in summer, it is also necessary to pay attention to timely soiling or irrigation. Due to the high temperature, urea conversion is fast, and the product after urea conversion is ammonium carbonate, which is less than the nature of ammonium bicarbonate, commonly known as “gas-fetal fertilizerâ€. Stable, it will produce large amounts of ammonia. If you do not bury urea in the soil or sprinkle it on the ground without immediate watering, then the consequences of volatilization of ammonia will cause the leaves to burn. In severe cases, the leaves of the plant will be boiled, even if the ammonia is not roasted. The loss of nitrogen caused by the leaves will also pollute the environment and reduce the utilization rate.
In short, urea as a top dressing application techniques: one to be applied in advance, the second to cover the soil.
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