University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 41 2 2011 01 21 A Study of Magnetic Susceptibility in Some Aquic and Non-aquic Soils of Fars Province A Study of Magnetic Susceptibility in Some Aquic and Non-aquic Soils of Fars Province 147 159 21864 FA H. R. Owliaei E. Adhami 0000-0002-3715-4420 A. K. Ejraei M. Najafi Gheiri M. Rajaei Journal Article 1970 01 01 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). 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). https://ijswr.ut.ac.ir/article_21864_7d31bda02eb45be68831963c7f8a574f.pdf