@techreport{oai:soar-ir.repo.nii.ac.jp:00016888,
 author = {矢彦沢,  清允 and 山本,  満寿夫 and 上野,  満夫 and 藤松,  仁},
 month = {Mar},
 note = {In Kohsyoku region，it has been found that the cropf .ai!ed reclaimed farms. Toc larify the cause，the soil induded in weathered and unweathered zones has beenivestigated by chemical analysis，s canning electron microscopic and X- ray diffraction method. 1n the soil of unweathered zones，v arious forms of framboidal mineralshave been found undei scanning electron microscope observations. The framboiqal minerals have been identified as pyrite by X -raydiffraction method. The pyrite content of subsoil was the range of 0.47 to 3.53 %ーThecontent of 3.53% in sedimentary muds is very high value. The yellow minerals found in the ridge between rice-fields has been identified as jarosite by X -ray diffraction method. The very acid soiJ was found to be drived from sulfuric acid which was produced by the oxidation of pyrite. It was then suggested that the acid soil is aa cid sulfate soi .l 1n the soil horizones con~aining pyrite，peat and so called Takasikozo have been coexisted. 1n addition，th e soil was ah eavy clay of drain ill. The region is af an irrigated by the Sanoh river that has the high acidity of sulfuric acid type. Accordingly，1t is then suggested that the framboidaJ pyrite in the deep subsoil in this farms has been formed by. sulfuric acid in Sanoh river., Article, 環境科学年報15:105-110(1993)},
 title = {更埴地方の改良農地に生成した酸性硫酸塩土壌とその成因的考察},
 year = {1993}
}