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First, when fertilizer urea is not suitable as a seed fertilizer, high concentration of 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 application of grass ash, lime, calcium magnesium phosphate fertilizer and other alkaline fertilizers and urea mixed or simultaneous application, it will promote the nitrogen in urea into ammonia and volatile. 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, it is not appropriate to apply urea together with organic manure, phosphorus and potash fertilizers to meet the needs of crop nutrients and improve the utilization of urea.
Fourth, water should not be applied immediately after application of nitrogen in urea is amide nitrogen, in the soil fluidity and leaching loss. 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, should not be high foliar spray foliar spraying urea solution concentration should not be too large, otherwise it will burn the leaves will 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, shallow urea shallow application of nutrients should not be 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.
How to apply urea scientifically
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: