NOVELTY - Preparing fertilizer involves crushing plant straw, cyanine and alfalfa, castor and tea seed cake, dry unpolluted river mud, dry dairy manure, dry pig manure, dry chicken manure into a crusher; after crushing the material adding organic fertilizer fermenting agent, then stirring them uniformly, turning stacked water sealing to ferment for 30 days to obtain organic fertilizer; feeding inorganic compound fertilizer, crushing humic acid chelate magnesium, humic acid chelated iron, chelated zinc humic acid, humic acid chelated manganese into crusher, and then mixing and fermentation.    USE - For preparing fertilizer for sweet-scented Osmanthus fragrant chestnut tree (claimed).    ADVANTAGE - The present method provides simple operation and low production cost; and is convenient use. The fertilizer obtained by the present method is rich in organic matter, nitrogen, phosphorus, potassium and humic acid chelate of state trace elements, increases hanging fruit number and single fruit weight of sweet Osmanthus incense chestnut tree, and also provides high yield of sweet Osmanthus incense chestnut tree.    DETAILED DESCRIPTION - Preparing fertilizer for sweet-scented Osmanthus fragrant chestnut tree involves crushing plant straw (containing corn straw (80%) and peanut straw (20%)) (15%), 1:1 cyanine and alfalfa (10%), castor and tea seed cake (5%), dry unpolluted river mud (20%), dry dairy manure (13-15%), dry pig manure (20-22%), dry chicken manure (5%) into a crusher; after crushing the material adding organic fertilizer fermenting agent (1.6%), then stirring them uniformly, turning stacked water sealing to ferment for 30 days (in summer) to obtain organic fertilizer; feeding inorganic compound fertilizer (containing nitrogen (40%), phosphorus (20%), potassium (40%)) (8%), crushing humic acid chelate magnesium (0.1%), humic acid chelated iron (0.1%), chelated zinc humic acid (0.1%), humic acid chelated manganese (0.1%) as powder into the crusher, and then mixing and fermentation to obtain the fertilizer.