PROBLEM TO BE SOLVED: To provide a coated seed, etc. which can promptly sink below the water surface while the amount of an iron material is reduced.SOLUTION: A coated seed is a seed the surface of which an inner layer containing an iron material and an outer layer containing bentonite are applied on.COPYRIGHT: (C)2014,JPO&INPIT【課題】鉄資材の使用量を抑制しつつ、水面下へ速やかに沈みうる被覆種子等を提供する。【解決手段】本発明に係る被覆種子は、鉄資材を含む内層とベントナイトを含む外層とが種子の表面に付与されてなる。【選択図】なし