Applying urea "two to two and not to"
Urea is one of the fertilizers often used in agricultural production, but there are some things to pay attention to during the application process, that is, "two to two and not to be."
Immediately after applying urea
Urea is an amine nitrogen fertilizer, which must be converted to ammonia nitrogen after application to be absorbed and used by crops. During the conversion process, due to different conditions such as soil quality, moisture, and temperature, the time may vary. Generally, it takes 2 to 10 days to complete. If urea is immediately irrigated or applied to dry land before heavy rain, urea will be lost immediately.
To be mixed with ammonium carbonate
After urea is applied to the soil, it needs to be converted into ammonia before it can be absorbed by crops. Its conversion rate is much slower under alkaline conditions than under acidic conditions. After the ammonium carbonate was applied to the soil, it showed an alkaline reaction with a pH value of 8.2 to 8.4. Mixed application of ammonium carbonate and urea will greatly reduce the conversion rate of urea into ammonia, which will easily cause the loss of volatilization and volatilization loss. Therefore, urea and ammonium carbonate should not be mixed or applied simultaneously.
Do not apply alone
The ideal application method is to apply organic fertilizer first, and then apply a reasonable formula of urea, calcium superphosphate and potassium chloride.
Don't cast on the surface
Urea is sprayed on the ground. It takes 4 to 5 days to convert the urea to be absorbed by the crops at room temperature. Most nitrogen is volatilized during the ammonium process and the utilization rate is only about 30%. Application of soil, the loss of nitrogen will be more. Therefore, nitrogen cannot be applied on the ground.
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