NOVELTY - Long-acting slow-release fertilizer comprises 10-15 pts. wt. 1250-2000-mesh diatomite, 12-15 pts. wt. ammonium humate, 8-10 pts. wt. triple superphosphate, 5-6 pts. wt. fruit residues, 6-8 pts. wt. soybean dregs, 4-5 pts. wt. grass meal, 5-7 pts. wt. sake lees vinegar, 1-2 pts. wt. white sugar, 0.5-1 pt. wt. xylose, 18-20 pts. wt. urea, 5-6 pts. wt. borax, 8-10 pts. wt. sodium carboxymethylcellulose, 6-8 pts. wt. redispersible latex powder, 2-3 pts. wt. ferric ammonium citrate, 8-10 pts. wt. ammonium dihydrogen phosphate, 0.1-0.2 pt. wt. calcium stearate, and 4-5 pts. wt. additive.    USE - Long-acting slow-release fertilizer.    ADVANTAGE - The fertilizer is rich in organic material, improves soil vitality, and reduces adverse effects caused by long-term fertilization on soil. The use of diatomite and slow-release coating agent in forming double-coated fertilizer nutrients prevents nutrient loss, improves nutrient utilization rate, prolongs fertilizer effect for nutrient balance of soil environment, improves crop yield and quality, and increases planting efficiency.    DETAILED DESCRIPTION - Long-acting slow-release fertilizer comprises 10-15 pts. wt. 1250-2000-mesh diatomite, 12-15 pts. wt. ammonium humate, 8-10 pts. wt. triple superphosphate, 5-6 pts. wt. fruit residues, 6-8 pts. wt. soybean dregs, 4-5 pts. wt. grass meal, 5-7 pts. wt. sake lees vinegar, 1-2 pts. wt. white sugar, 0.5-1 pt. wt. xylose, 18-20 pts. wt. urea, 5-6 pts. wt. borax, 8-10 pts. wt. sodium carboxymethylcellulose, 6-8 pts. wt. redispersible latex powder, 2-3 pts. wt. ferric ammonium citrate, 8-10 pts. wt. ammonium dihydrogen phosphate, 0.1-0.2 pt. wt. calcium stearate, and 4-5 pts. wt. additive. The additive comprises 12-15 pts. wt. poultry feather, 30-35 pts. wt. 30-40% sulfuric acid solution, sodium hydroxide, 0.15-0.2 pt. wt. keratinase, 1-2 pts. wt. copper citrate, 1-2 pts. wt. manganese citrate, 1-2 pts. wt. zinc citrate, 20-22 pts. wt. medical stone powder, and 5-6 pts. wt. sodium silicate. The additive is prepared by washing poultry feather with water, high-temperature sterilizing, crushing, adding sulfuric acid solution, hydrolyzing for 15-18 hours, adding sodium hydroxide solution to adjust pH to 6.5-7, heating to 50-60 degrees C, adding keratinase and performing enzymolysis for 12-15 hours, adding copper citrate, manganese citrate and zinc citrate, stirring for 2-3 hours, adding sodium silicate, continuously stirring for 30-40 minutes, adding medical stone powder, uniformly stirring, drying, and grinding for 40-50 minutes. An INDEPENDENT CLAIM is included for slow-release fertilizer production by:    (A) mixing fruit residues, soybean dregs and sake lees vinegar; crushing; adding grass meal, white sugar, xylose and water; and fermenting;    (B) mixing water with equal amount of diatomite, grinding for 20-30 minutes to prepare diatomite slurry, adding ammonium humate, ferric ammonium citrate and borax, uniformly stirring, and dehydrating and drying to prepare diatomite coating material;    (C) mixing deionized water with sodium carboxymethylcellulose, stirring and heating to 50-60 degrees C until sodium carboxymethylcellulose is completely dissolved and dispersed, adding redispersible latex powder and calcium stearate, and high-speed stirring for 2-3 hours to obtain slow-release agent; and    (D) uniformly mixing fermented material and diatomite coating material with the remaining raw materials, granulating, spraying slow-release coating agent on surface of granules, hot-air-drying, and cooling to room temperature.