< Topic >Be able to actualize the coating whose falling off of the iron powder is little not only seeding process regarding transport process, the secondary materials which at the same time are beneficial to the growth of the seed the seed which was covered with the iron powder for secondary materials content seed coating, the iron powder for secondary materials adhesion seed coating, the alloy steel powder for seed coating and the iron powder for secondary materials content seed coating, the iron powder for secondary materials adhesion seed coating and the alloy steel powder for seeding child coating which in growth of the seed can make the seed come in contact with desirable feature is obtained. SolutionsThe iron powder for secondary materials content seed coating which relates to this invention 0.01 - 100 mass sections contains the secondary materials powder vis-a-vis the iron powder 100 mass section, as for the aforementioned iron powder, particle diameter mass ratio of the iron powder of 63 millimicrons or less 75% or less of 0% or more, at the same time, particle diameter exceeds 63 millimicrons and mass ratio of the iron powder of 150 millimicrons or less 100% or less of 25% or more, mass ratio of the iron powder where at the same time particle diameter exceeds 150 millimicrons is 50% or less of 0% or more, it features that mean particle diameter of the aforementioned secondary materials powder is 45 millimicrons or lessIt is the thing. < Selective figure > Figure 1【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63μm以下の鉄粉の質量比率が0%以上75%以下、かつ、粒子径が63μmを越え150μm以下の鉄粉の質量比率が25%以上100%以下、かつ粒子径が150μmを越える鉄粉の質量比率が0%以上50%以下であり、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
