PROBLEM TO BE SOLVED: To provide: an iron powder for an auxiliary-material-containing seed coating an iron powder for an auxiliary-material-adhered seed coating and an alloy steel powder for a seed coating, in which it is possible to achieve a coating that has little shedding of iron powder not only in a sowing step but also in a transportation step, and it is possible to coat the seeds with an auxiliary material beneficial for the growth of the seed in a state that is favorable to seed growth, and to provide a seed coated with an iron powder for an auxiliary-material-containing seed coating, an iron powder for an auxiliary-material-adhered seed coating or and an alloy steel powder for a seed coating.SOLUTION: The iron powder for an auxiliary-material-containing seed coating includes 0.01-100 pts.mass of an auxiliary material powder based on 100 pts.mass of iron powder, wherein in the iron powder, the mass ratio of the iron powder having at most 45 &mum of a particle diameter is more than 85%, and the average particle diameter of the auxiliary material powder is at most 45 &mum.COPYRIGHT: (C)2012,JPO&INPIT【課題】播種工程のみならず輸送工程においても鉄粉の脱落が少ない被覆が実現でき、かつ種子の成長に有益な副資材を種子の成長に好ましい態様で種子に付着させることができる副資材含有種子被覆用鉄粉、副資材付着種子被覆用鉄粉、種子被覆用合金鋼粉及び、副資材含有種子被覆用鉄粉、副資材付着種子被覆用鉄粉または種子被覆用合金鋼粉で被覆された種子を得る。【解決手段】本発明に係る副資材含有種子被覆用鉄粉は、鉄粉100質量部に対して副資材粉末を0.01~100質量部含有し、前記鉄粉は、粒子径が45μm以下の鉄粉の質量比率が85%超であり、前記副資材粉末の平均粒子径が45μm以下であることを特徴とするものである。【選択図】 図1
