▎ 摘　　要

NOVELTY - Preparing long-acting water-soluble iron fertilizer involves mixing graphene oxide and soluble ferrous salt in a solution system and co-precipitating under alkaline conditions to obtain a composite product. The composite product is oxidized. USE - Method for preparing long-acting water-soluble iron fertilizer suitable for acid soil (claimed). ADVANTAGE - The water-soluble iron fertilizer prepared by the method is water-soluble and can be completely dispersed in water to form a suspension water-soluble fertilizer. After being applied to the soil, compared with the iron ions in the soil, the iron oxide loaded on graphene oxide is not easily washed away by rain. And under the corrosion of acidic soil, iron oxides are gradually corroded into iron ions and absorbed by plants, which effectively realizes the purpose of long-lasting slow-release and water-soluble iron fertilizer, and reduces the number of times iron fertilizer is applied. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a long-lasting water-soluble iron fertilizer, which can be dispersed in water to form a suspension.