PROBLEM TO BE SOLVED: To provide iron powder for a seed coating film and a coating material for seed that can be easily and reliably adhered to the whole seed outer surface, and are superior in mass productivity.SOLUTION: Iron powder for a seed coating film according to the present invention is the iron powder for a seed coating film adhered to a seed outer surface, and comprises amorphous iron oxide powder and atomized iron powder having a ratio of passing a sieve of 90 mass% or more, the sieve having an opening of 106 μm, and the iron powder for a seed coating film has an apparent density of 2.51 g/cm3 or more and less than 3.18 g/cm3. Preferably, a mass ratio of the iron oxide powder to the atomized iron powder is 1 or less. Preferably, a ratio of passing a sieve with an opening of 150 μm of the iron oxide powder is 92 mass% or more. The coating material for seed according to the present invention comprises the iron powder for a seed coating film and an oxidation accelerator. The apparent density of the coating material for seed is preferably 1.99 g/cm3 or more and less than 2.50 g/cm3.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】本発明の課題は、容易かつ確実に種子外面全体に付着させることができる量産性に優れる種子皮膜用鉄粉及び種子用コーティング材を提供することにある。【解決手段】本発明に係る種子皮膜用鉄粉は、種子外面に付着される種子皮膜用鉄粉であって、不定形の酸化鉄粉と、目開き106μmの篩を通過する割合が90質量%以上のアトマイズ鉄粉とを含み、見掛け密度が2.51g/cm3以上3.18g/cm3以上である。上記酸化鉄粉の上記アトマイズ鉄粉に対する質量比が1以下であるとよい。上記酸化鉄粉のうち目開き150μmの篩を通過する割合が92質量%以上であるとよい。本発明に係る種子用コーティング材は、上記種子皮膜用鉄粉と、酸化促進剤とを含む。当該種子用コーティング材の見掛け密度は1.99g/cm3以上2.50g/cm3未満であるとよい。【選択図】なし
