NOVELTY - Fertilizer is prepared using e.g. wheat bran, fermented cottonseed hull, mushroom residue, wheat flour, bentonite, zeolite powder, bamboo charcoal powder, ferrous sulfate, soil conditioner and suitable amount of water. The preparation method involves mixing above-mentioned raw materials with ammonium sulfate and suitable amount water to obtain slurry, heating obtained slurry, adding ammonium persulfate to obtained mixture, stirring and reacting mixture, heating and concentrating mixture to obtain paste, granulating obtained paste and drying to obtain product.    USE - The fertilizer is useful for fruit trees (claimed).    ADVANTAGE - The fertilizer is rich in nutrient, protein, carbohydrate, and vitamin and mineral and highly economical and absorbs heavy metals and other harmful substances and hence purifies soil.    DETAILED DESCRIPTION - Fertilizer is prepared using 200-230 pts. wt. wheat bran, 100-120 pts. wt. fermented cottonseed hull, 120-140 pts. wt. mushroom residue, 20-24 pts. wt. wheat flour, 20-24 pts. wt. bentonite, 12-15 pts. wt. zeolite powder, 12-15 pts. wt. bamboo charcoal powder, 16-19 pts. wt. potassium chloride, 10-12 pts. wt. urea, 4-6 pts. wt. ferrous sulfate, 3-5 pts. wt. zinc sulfate, 2-3 pts. wt. sodium sulfate, 1-2 pts. wt. calcium lignosulfonate, 6-9 pts. wt. effective microorganism (EM), 10-15 pts. wt. soil conditioner and suitable amount of water, where the soil conditioner comprises 120-140 pts. wt. diatomite, 30-40 pts. wt. bamboo charcoal, 1-2 pts. wt. nano carbon powder, 4-5 pts. wt. sodium metasilicate, 3-4 pts. wt. sodium selenite, 4-5 pts. wt. zinc sulfate, 3-4 pts. wt. sodium polyacrylate, 0.1-0.14 pts. wt. citric acid cerium, 2-3 pts. wt. manganese sulfate, 6-8 pts. wt. chitosan, 1-2 pts. wt. eucalyptus oil, 2-3 pts. wt. nano jade powder, 1-2 pts. wt. ammonium persulfate, 2-3 pts. wt. phytic acid and suitable amount of water. The preparation method involves mixing the above-mentioned raw materials with ammonium sulfate and suitable amount water to obtain slurry, heating the obtained slurry at 80-90 degrees C, adding ammonium persulfate to the obtained mixture, stirring and reacting for 40-60 minutes, heating and concentrating the mixture to obtain paste, granulating obtained paste and drying to obtain product.