a study of magnetic susceptibility in some aquic and non-aquic soils of fars province

soil drainage conditions significantly affect the chemical properties of soil, particularly type and the extent of iron oxides. soil magnetic susceptibility (?) has a close relationship with drainage conditions. eight soil profiles, in four regions of fars province, with aquic and non-aquic soil moisture regimes were studied to determine the effect of drainage conditions on ? and on chemical forms of fe-oxide. a positive and significant correlation was noticed between ? and fed. aquic soils bore distinctly lower ?s than non-aquic soils (19.9 vs. 32.5). magnetic susceptibility of surface horizons was greater than that of sub-surface horizons in most of the soils (31 vs. 19.6), which is probably a result of pedogenic formation of ferrimagnetic minerals in soil surface. aquic and non-aquic soil lost 41 and 64 percent of their ? after cbd extraction, reflecting differences in the source of ?. sequential heating of soil samples upto 550 °c resulted in more enhancement of ?, in aquic soils as compared with non-aquic soils, (451% vs. 155%) which was attributed to the conversion of canted antiferromagnetic minerals to ferromagnetic ones. the value of ? decreased when heated from 550 to 700 °c (about 100% in both soil groups).