Abstract: The coated potassium plus urea and its preparation method involve an improvement of the existing chemical fertilizer and its manufacturing process. The composition of the coated potassium-added urea according to the present invention contains urea 55-70%, potassium chloride 25%-35%, organic matter 5-10%; the outer surface of the product is coated with the above ratio of 100 % of the pest control organic oil 0.2-0.4%, resin film 0.4-1.3% envelope. The preparation method mainly comprises mixing the above components into a granulator, granulating at 3-5 minutes and 38-54 ° C, and drying at 55-88 ° C; the ratio is 100%. 0.2-0.4% of the pest-preventing organic oil and 0.4-1.3% of the resin film are mixed into a coating agent, and coated at 2-4 minutes and 50-60 °C. The product of the invention can greatly reduce the production cost and labor intensity and improve the yield and quality of agricultural products while greatly improving the fertilizer efficiency.
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