Urea is a kind of quick-acting nitrogen fertilizer with high fertilizer efficiency. However, if it is used improperly, it will not only cause waste of fertilizer but also cause “fat harmâ€. The seven aspects that must be noted when applying urea are described below:
First, it is not suitable for fertilizer. When urea is used as seed fertilizer, high-concentration urea can destroy the protein structure of the seed and have toxic and inhibitory effects on the seed. If it must be applied as a fertilizer, avoid contact with the fertilizer and control the amount.
Second, should not be mixed with alkaline fertilizer or simultaneous application. Alkaline fertilizers such as ash, lime, calcium magnesium phosphate, etc., and urea mixed or applied at the same time, will promote the nitrogen in urea to become ammonia and volatilize. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 4 to 5 days, and winter and spring should be staggered for 7 to 8 days.
Third, should not be a single application. Urea should be applied in combination with organic fertilizers, phosphorus and potash fertilizers to meet the needs of various crop nutrients and improve the utilization of urea.
Fourth, it should not be immediately watered after application. The nitrogen in urea is an amide nitrogen and has high mobility and leaching in soil. Therefore, after topdressing urea, do not water it before it is converted, otherwise it will be wasteful. Generally summer and autumn should be watered 2 to 3 days after application, winter and spring seasons should be watered after 7 to 8 days.
Fifth, it is not suitable for high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Usually, the concentration of corn, wheat, rice, and cotton is 2%, and that of vegetables and fruits is 0.5% to 1%.
Six, should not be shallow. Urea shallow nutrient points volatile, easily absorbed by weeds. The deep application of urea is conducive to the exertion of fertilizer efficiency. When applying topdressing, the seedlings should be applied beside the seedlings or the ditch be applied on the seedling side, and the depth should also be 10 to 15 cm.
Seven, it should not be used too much, too late. Urea nitrogen content of 44% to 48%, high nutrient content, the amount should not be too large, so as not to waste. The application of urea is too late and it is easy to cause late-maturing crops. The application amount of general crops per acre is 5 to 15 kg, 4 to 7 days earlier than other nitrogen fertilizers.
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