Urea fertilization precautions

    Urea has high nitrogen content, long fertility and convenient application, which is very popular among farmers. To fully utilize the role of urea, pay attention to the following items during use:

    The applicator surface can not be: at the surface applicator of urea, at room temperature to go through 4--5 days of conversion can be absorbed by plants, most of the nitrogen is volatilized in the amination process, the utilization of only about 30%. Therefore, fertilization cannot be applied on the surface.

    Avoid using seed fertilizer: When using urea as a seed fertilizer, a small amount of biuret is often produced during the conversion process. If the biuret content exceeds 2% , it will poison the seedlings and seeds.

    Can not be mixed with alkaline fertilizer: urea must be converted into ammonia nitrogen after being applied to be used by crops. Under alkaline conditions, most of the nitrogen in ammonia nitrogen will become ammonia gas, so urea cannot It is mixed with or applied at the same time with alkaline fertilizers such as plant ash, calcium magnesium phosphate, and ammonium bicarbonate.