First, should not be mixed with alkaline fertilizer or applied with urea can not be mixed with lime, grass ash, calcium magnesium phosphate fertilizer and other alkaline fertilizers applied simultaneously. In general, in summer and autumn, urea and alkaline fertilizers should be staggered for 3 to 4 days, and winter and spring should be staggered for 7 to 8 days.
Second, should not be used as a seed dressing urea in the production process produces a small amount of biuret, when the biuret content exceeds 2%, it will produce poisonous seed and seedlings, affecting seed germination and seedling growth.
Third, should not be immediately after the application of irrigation if applied immediately after application of irrigation or dry land before the heavy rain, urea will dissolve in the water and loss. Normal summer and autumn season should be 2 to 3 days after application to irrigation, winter and spring season should be 7-8 days after application irrigation.
Fourth, unfavorable surface application of urea at room temperature requires 4 to 5 days of conversion before it can be used. If applied to the surface, most of them evaporate during the ammoniation process. The actual utilization rate is only about 30%. If applied in soils with high levels of alkaline soils and organic matter, nitrogen loss will be faster. Deep urea is beneficial to the exertion of fertilizer effect.
Fifth, it should not be used too late to apply urea too late to the performance of fertilizer, easy to cause crops greed green late, it should generally be applied 4 to 7 days earlier than other nitrogen fertilizer.
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