Apply Nitrogen Fertilizer

Urea is a physiologically neutral fertilizer that does not leave any harmful substances in the soil, and long-term application has no adverse effects. However, excessively high temperature during granulation will produce a small amount of biuret, also called biuret, which has an inhibitory effect on crops. my country stipulates that the content of urea biuret used in fertilizers should be less than 0.5%. When the biuret content exceeds 1%, seed fertilizer, seedling fertilizer and foliar fertilizer cannot be used, and the urea content in other application periods should not be too much or too concentrated.

Urea is an organic nitrogen fertilizer. After being hydrolyzed into ammonium carbonate or ammonium bicarbonate by the action of urease in the soil, it can be absorbed and utilized by crops. Therefore, urea should be applied 4 to 8 days before the fertilization period of the crop.

Application: Urea is suitable for base fertilizer and top dressing, and sometimes it is also used as seed fertilizer. Before conversion, urea is in a molecular state and cannot be adsorbed by the soil. It should be prevented from being lost with water; the ammonia formed after conversion is also volatile, so urea should be covered with soil deeply.