NOVELTY - Complex fertilizer comprises sheep manure, sweet potato residues, bone powder, rice husk powder, gypsum powder, calcium lactate, ammonium sulfate, ammonium nitrate, potassium sulfate, ferrous sulfate, nickel sulfate, cobalt sulfate, fermentative bacteria, yeast, water and soil-modifying agent. The soil-modifying agent comprises clay, Kanuma soil, sawdust, maple leaves, fresh shrub, Crotalaria leaves, fulvic acid, nanocarbon powder, white radish, zinc gluconate, hyacinth, Cayratia, calcium hydrogen phosphate, and calcium cyanamide.    USE - The complex fertilizer is useful for grapes (claimed).    ADVANTAGE - The complex fertilizer is rich in nutrients e.g. trace elements, and improves yield and quality of crops.    DETAILED DESCRIPTION - Complex fertilizer comprises 36-48 pts. wt. sheep manure, 36-48 pts. wt. sweet potato residues, 20-36 pts. wt. bone powder, 12-18 pts. wt. rice husk powder, 8-10 pts. wt. gypsum powder, 6-7 pts. wt. calcium lactate, 5-6 pts. wt. ammonium sulfate, 4-5 pts. wt. ammonium nitrate, 5-6 pts. wt. potassium sulfate, 4-5 pts. wt. ferrous sulfate, 3-5 pts. wt. nickel sulfate, 4-5 pts. wt. cobalt sulfate, 3-6 pts. wt. fermentative bacteria, 3-4 pts. wt. yeast, 2-3 pts. wt. water and soil-modifying agent (suitable quantity). The soil-modifying agent comprises 18-24 pts. wt. clay, 14-18 pts. wt. Kanuma soil, 10-15 pts. wt. sawdust, 9-16 pts. wt. maple leaves, 8-12 pts. wt. fresh shrub, 6-8 pts. wt. Crotalaria leaves, 6-7 pts. wt. fulvic acid, 5-8 pts. wt. nanocarbon powder, 4-7 pts. wt. white radish, 5-6 pts. wt. zinc gluconate, 4-6 pts. wt. hyacinth, 4-6 pts. wt. Cayratia, 3-5 pts. wt. calcium hydrogen phosphate, and 4-5 pts. wt. calcium cyanamide. The soil-modifying agent is prepared by (a) calcining clay and Kanuma soil, and grinding into fine powder, (b) adding Cayratia, hyacinth, and Crotalaria leaves, and (c) grinding calcium hydrogen phosphate, calcium cyanamide, and zinc gluconate into fine powder, uniformly mixing obtained powder, and adding remaining raw materials, and products obtained in the steps (a) and (b), and crushing and drying obtained product. An INDEPENDENT CLAIM is included for method for preparing the complex fertilizer, which involves (a) mixing sweet potato residues, bone powder, and rice husk powder and adding water (suitable quantity), boiling mixture for 30-60 minutes, and cooling boiled mixture and adding potassium sulfate, (b) drying sheep manure and mixing with fermentative bacteria, yeast, gypsum powder, and ammonium sulfate, adding water to mixture, and fermenting obtained mixture for 15-20 days, and (c) grinding ferrous sulfate, cobalt sulfate, nickel sulfate, and ammonium nitrate into fine powder, sieving fine powder using sieve of 100-140 mesh size, and adding mixture obtained in the step (a) and fermented mixture obtained in the step (b), performing fermentation at 30-40 degrees C for 10-15 days, and drying and granulating product.