When urea is used as top dressing in summer, it is also necessary to pay attention to timely soiling or irrigation. Due to high temperatures, urea conversion is fast, and the product after urea conversion is ammonium carbonate.
It is more unstable than Ammonium Bicarbonate, commonly known as gas-to-child fat, and produces a large amount of ammonia. If you do not bury urea in the soil, or if you sprinkle it on the surface
Without immediate watering, then the consequences of ammonia volatilization will cause the leaves to burn. In severe cases, the leaves of the plants will be boiled, even if the ammonia does not volatilize.
Burning seedlings and burning leaves will also cause environmental pollution and reduce the use of nitrogen.
The application of urea as top dressing: First, it must be applied in advance, and second, it must be covered with soil.
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