| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron ion supply material which can efficiently supply iron ions to a plant.SOLUTION: This invention provides an iron ion supply material to serve as a source of supply of iron ions, the material supplying iron ions, which contribute to the growth of a plant, wherein the material comprises iron powder comprising iron of 80 mass% or more, and 50 mass% or more of the whole iron powder has a particle diameter of 100 μm or more 10 mm or less. |
