Special organic/inorganic compound fertilizer for sugarcane produced by use of filter mud from sugar factory

The invention discloses a special organic/inorganic compound fertilizer for sugarcane produced by use of the filter mud from a sugar factory. The special organic/inorganic compound fertilizer is prepared from the following raw materials in percentage by weight: 4.17-42.87% of urea, 11.52-60.87% of calcium superphosphate or calcium magnesium phosphate, 3.33-16.66% of potassium chloride and 25.0-37.5% of dry filter mud. The special organic/inorganic compound fertilizer is prepared by the following steps of: (1) stacking the filter mud for natural fermentation; rotting the stacked filter mud for ripening from top to bottom; spreading the rotten filter mud; drying in the sunlight until the water content is 15-25%, and grinding the filter mud by a grinder; adding nitrogen, phosphorus and potash fertilizer into the filter mud after fermentation and grinding according to the proportion of the raw materials; mixing and then grinding, granulating, drying, cooling and screening; and packaging to obtain a finished product. The special organic/inorganic compound fertilizer disclosed by the invention has the advantages of long fertilizer efficiency, soil improvement, soil fertility improvement, avoidance of soil hardening and the like, can effectively improve the yield per unit by 0.5-1.0 ton of sugarcane and the sugar content of the sugarcane by 0.5-1.0%, and also can improve the utilization rate of the chemical fertilizer by 3-5%.