PROBLEM TO BE SOLVED: To provide an oxygen sustained-release agent capable of maintaining oxygen sustained-release performance over a long period, even if being eluted into water of river, harbor or the like, not causing eutrophication derived from phosphorous high in an environmental load, capable of evading the increase only of phosphorous in a plant medium, and also capable of simplifying a stage of adding the soil or the like.SOLUTION: Provided is an oxygen sustained-release agent including magnesium peroxide and an organic acid salt.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 酸素徐放性能を長期間維持することができ、河川、港湾等の水中に溶出した場合でも環境負荷の大きいリン由来の富栄養化を生じず、植物培地におけるリンのみの増加を回避することができ、かつ、土壌等に添加する工程を簡略にすることができる酸素徐放剤を提供すること。【解決手段】 酸素徐放剤は過酸化マグネシウムと、有機酸塩とを含む。【選択図】 図１
