▎ 摘　　要

NOVELTY - Preparing graphene-capsule slow-release farmyard fertilizer involves putting nano zinc oxide in a furnace, passing in a protective gas, and then raising the temperature to 450-800 degrees C, while maintaining the protective gas, passing in a catalytic carbon source gas for catalytic reaction, reacting at 450-800 degrees C temperature for 80-100 minutes, and then cooling to room temperature to obtain a graphene/zinc oxide composite material, immersing in a nitric acid solution to remove nano zinc oxide, then separating, dry, and keeping it at 900-1500 degrees C temperature for 6-10 hours under the protection of a protective gas to obtain a graphene capsule, and mixing the graphene capsule and farm manure in 0.5-5:1 ratio to obtain the product. USE - Method for preparing graphene-capsule slow-release farmyard fertilizer (claimed). ADVANTAGE - The method offers product having significant synergistic effect on farm manure, and improves the growth, yield and quality of crops, can fix heavy metal ions in the soil, reduce environmental pollution, and have cleaning effect on the environment. The composition is simple, contains no harmful chemicals, and the graphene capsules can be easily washed away with water without affecting human health.