NOVELTY - Organic-inorganic compound slow-release fertilizer comprises diatomite, old Chinese cabbage leaves, urea, ground calcium carbonate, potassium sulfate, acorn powder, waste tobacco leaves, celery roots and leaves, cabbage roots and leaves, manganese sulfate, borax, ferric citrate, sodium tetraborate, decayed domestic waste fertilizer, natural calcium bentonite, olive oil, sodium carbonate, potassium chloride, seaweed gel, and additive which includes poultry feather, sulfuric acid solution, sodium hydroxide, keratinase, copper citrate, manganese citrate, zinc citrate and sodium silicate.    USE - Organic-inorganic compound slow-release fertilizer.    ADVANTAGE - The fertilizer enhances soil activity and the nutrients are easily absorbed by crops. The use of diatomite and slow-release coating agent in forming double-coated fertilizer nutrients prevents nutrient loss and prolongs fertilizer effect, thus, promoting robust crop growth, enhancing crop disease resistance and increasing crop yield. The slow-release coating agent is completely degradable, without destroying soil environment.    DETAILED DESCRIPTION - Organic-inorganic compound slow-release fertilizer comprises 10-15 pts. wt. 1250-2000-mesh diatomite, 6-8 pts. wt. old Chinese cabbage leaves, 18-20 pts. wt. urea, 8-10 pts. wt. ground calcium carbonate, 12-15 pts. wt. potassium sulfate, 1-3 pts. wt. acorn powder, 1-3 pts. wt. waste tobacco leaves, 4-6 pts. wt. celery roots and leaves, 2-4 pts. wt. cabbage roots and leaves, 1-2 pts. wt. manganese sulfate, 3-5 pts. wt. borax, 2-4 pts. wt. ferric citrate, 1-2 pts. wt. sodium tetraborate, 18-20 pts. wt. decayed domestic waste fertilizer, 8-10 pts. wt. natural calcium bentonite, 6-8 pts. wt. olive oil, 6-9 pts. wt. sodium carbonate, 5-8 pts. wt. potassium chloride, 15-18 pts. wt. seaweed gel, 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 old Chinese cabbage leaves, waste tobacco leaves, celery roots and leaves, cabbage roots and leaves and olive oil; crushing; adding water; and fermenting;    (B) mixing water with equal amount of diatomite; grinding for 20-30 minutes to prepare diatomite slurry; adding acorn powder, manganese sulfate, borax and ferric citrate; uniformly stirring; and dehydrating and drying to prepare diatomite coating material;    (C) mixing seaweed gel, sodium tetraborate and deionized water, heating to 60-80 degrees C, and stirring to prepare slow-release coating 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.