NOVELTY - A fertilizer additive comprises 3-5 pts. wt. montmorillonite powder, 1-2 pts. wt. plant ash, 1-3 pts. wt. peat, 3-6 pts. wt. sludge, 5-10 pts. wt. crushed leaves, 6-15 pts. wt. pomegranate rind, 0.3-0.5 pt. wt. dicyandiamide, 0.1-0.2 pt. wt. thiourea, 10-12 pts. wt. activated carbon, 40-45 pts. wt. pomace, 3-5 pts. wt. shell powder, 3-5 pts. wt. silica-calcium powder, 1-2 pts. wt. lignin, 0.1-0.2 pt. wt. effective microorganisms agent, 0.1-0.2 pt. wt. Bacillus subtilis, and 2-4 pts. wt. composite deodorizer.    USE - Fertilizer additive used for improving soil acidification (claimed).    DETAILED DESCRIPTION - A fertilizer additive comprises 3-5 pts. wt. montmorillonite powder, 1-2 pts. wt. plant ash, 1-3 pts. wt. peat, 3-6 pts. wt. sludge, 5-10 pts. wt. crushed leaves, 6-15 pts. wt. pomegranate rind, 0.3-0.5 pt. wt. dicyandiamide, 0.1-0.2 pt. wt. thiourea, 10-12 pts. wt. activated carbon, 40-45 pts. wt. pomace, 3-5 pts. wt. shell powder, 3-5 pts. wt. silica-calcium powder, 1-2 pts. wt. lignin, 0.1-0.2 pt. wt. effective microorganisms agent, 0.1-0.2 pt. wt. Bacillus subtilis, and 2-4 pts. wt. composite deodorizer. The composite deodorizer comprises 2-4 pts. wt. Ligusticum chuanxiong, 1-3 pts. wt. Baeckea, 1-3 pts. wt. Eucalyptus tree fruit, 2-4 pts. wt. plantain, 3-5 pts. wt. zeolite powder, 1-3 pts. wt. straw biomass coal, 0.1-0.3 pt. wt. sodium pyrophosphate, 1-2 pts. wt. chitosan, 0.1-0.3 pt. wt. sodium citrate, 2-3 pts. wt. peach powder, and 0.3-0.4 pt. wt. zinc chloride, prepared by drying Ligusticum chuanxiong, Baeckea, Eucalyptus tree fruit, and plantain and crushing into 100-200 meshes powder; mixing zeolite powder and straw biomass coal, UV radiating for 18-22 hours, adding prepared powder and peach powder, and mixing; and adding remaining raw materials and water, mixing, and spray-drying. An INDEPENDENT CLAIM is included for preparation of additive comprising mixing dicyandiamide and thiourea, adding water, and stirring; introducing into fermentor, injecting water at 100 degrees C, standing for 40-50 minutes, adding peat, sludge, crushed leaves, pomegranate rind, pomace, and effective microorganisms agent, fermenting for 10-12 days, adding remaining raw materials, fermenting for 15-20 days, filtering, and stirring; and spray-drying and granulating.