NOVELTY - Root-friendly magnetized slow-release fertilizer comprises 80-90 pts. wt. bone meal, 12-15 pts. wt. calcium nitrate, 150-160 pts. wt. earthworm manure, 120-140 pts. wt. tobacco powder, 18-20 pts. wt. carnallite powder, 25-30 pts. wt. carbamide, 75-95 pts. wt. coal ash, 50-60 pts. wt. pyrite ash, 18-22 pts. wt. cassava starch, 5-7 pts. wt. calcium acetate, 16-18 pts. wt. composite biological agent, and balance water. The composite biological agent comprises sulfate-reducing bacteria, heterotrophic iron-reducing bacteria and Bacillus subtilis at ratio of 1:1:2.    USE - Root-friendly magnetized slow-release fertilizer used for promoting growth and development of crop root.    ADVANTAGE - The fertilizer has easily absorbed raw materials, can fertilize soil to optimize crop root structure, prevents fungal infection caused by damage to root system, promotes inducing root to extend to deep soil, and increases crop nutrient absorption capacity and crop production performance.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of fertilizer comprising taking coal ash, placing in high temperature furnace, sintering at 750-850 degrees C for 40 minutes, taking out, cooling, placing pyrite ash into high temperature furnace, sintering 500-600 degrees C for 30 minutes, taking out, cooling, mixing sintered coal ash and pyrite ash, adding more than 5 mm magnet at weight ratio of 4:1, shaking for 40-60 minutes, and sieving through 80-100 meshes sieve; taking earthworm manure, tobacco powder and bone meal, crushing, mixing, adding into fermentation tank, fermenting at 30-40% moisture content for 3-4 weeks, pressing, and separating fermentation liquid and slag; mixing slag, first step product, carnallite powder and carbamide, stirring, placing in granulator, granulating, placing in magnetizing machine, and magnetically processing at 3500-4500 mT for 12-15 seconds; mixing fermentation liquid and cassava starch, heating to 60-80 degrees C for 25-35 minutes, cooling to room temperature, adding calcium acetate and calcium nitrate, heating to 60-70 degrees C for 30-40 minutes, cooling, adding to composite biological agent, stirring, placing in magnetizing machine, and magnetically processing at 300-400 mT for 5 minutes; and coating to third step product using high pressure spray, drying at low temperature, weighing, packaging, and storing in warehouse far away from ferrous metal material.