PROBLEM TO BE SOLVED: To disinfect soil, topsoil or foliage surface in a simple and safe process and to provide a soil and a cultivation environment suitable for growing crops. SOLUTION: A soil containing a divalent iron compound and an organic acid. Disinfecting material and method for disinfecting soil, topsoil or leaf surface including the step of applying the disinfecting material to soil, topsoil or leaf surface [Selection diagram] Fig. 2【課題】簡易、安全な工程で土壌、表土、又は葉面の消毒を行うこと及び農作物の生育に適した土壌や栽培環境を提供すること【解決手段】 二価鉄化合物と有機酸を含む土壌消毒用資材及びこの土壌消毒用資材を土壌、表土、又は葉面に施用する工程を含む土壌、表土、又は葉面の消毒方法【選択図】図2