PROBLEM TO BE SOLVED: To provide a soil improvement method or soil improvement materials for growth of plants in strong acid peat soil.SOLUTION: A method of improving strong acid peat soil comprises treatment of soil improvement materials comprising slag as an active ingredient. There is also provided soil improvement materials used for the method.COPYRIGHT: (C)2014,JPO&INPIT【課題】強酸性泥炭土壌において植物を生育せしめるための土壌改良方法または土壌改良資材の提供。【解決手段】スラグを有効成分として含む土壌改良資材を処理することを含む、強酸性泥炭土壌を改良する方法または該方法に用いられる土壌改良資材。【選択図】図1