Four misunderstandings in the use of urea fertilizer

Urea is one of the most important chemical fertilizers to increase crop yield, but at present, there are many unreasonable phenomena in the application process of farmers. These inappropriate application methods not only cause a lot of unnecessary waste, but also seriously pollute the agricultural environment and groundwater resources. Therefore, attention should be paid to the following four misunderstandings when making urea.

Mixture of urea and ammonium bicarbonate

After urea is applied into soil, it has to be converted into ammonia before it can be absorbed by crops, and its conversion rate is much slower in alkaline conditions than in acidic conditions. Ammonium bicarbonate showed alkaline reaction after being applied to the soil, and the PH value was 8.2-8.4. The mixed application of ammonium bicarbonate and urea in farmland will greatly slow down the conversion of urea to ammonia, which is easy to cause urea loss and volatilization loss. Therefore, urea and ammonium bicarbonate should not be mixed or applied at the same time.

Surface spreading

Urea is spread on the surface and can only be absorbed by crops after 4-5 days of transformation at room temperature. most of the nitrogen is volatilized in the process of ammoniation, and the utilization rate is only about 30%. Nitrogen loss is faster and more. Therefore, nitrogen cannot be spread on the surface.

Urea as seed fertilizer

A small amount of biuret is often produced in the production process of urea. If the biuret content exceeds 2%, it will be toxic to seeds and seedlings. Urea into seeds and seedlings will cause protein denaturation and affect seed germination and seedling growth.

Irrigation immediately after urea application

Urea is an amine nitrogen fertilizer, which must be converted into ammonia nitrogen before it can be absorbed and utilized by crops. The transformation process takes a long and short time due to different soil quality, moisture and temperature, and it usually takes 2 to 10 days to complete. If urea is applied immediately after irrigation and drainage or applied in dry land before heavy rain, urea will be dissolved in water and lost.