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Pedogenic Behavior of Iron Oxides Extractable by Colorimetric and DCB Methods for Some Soils in Nineveh Province | ||
| Journal of Tikrit University For Agriculture Sciences | ||
| Article 1, Volume 14, Issue 2, 2014, Pages 250-260 | ||
| Author | ||
| Mohammed Tahir Said Khalil | ||
| Abstract | ||
| Thirty soil samples representing six soil pedons within Aridisols and Inceptisols in Nineveh province//northern Iraq to introduce pedogenic distribution of colorimetric and DCB extractable free iron oxides related to soil properties and topography. Results referred that colorimetric extractable free iron oxides were ranged from (1482- 423) mg.kg-1 compared with that of DCB method which were ranged from (1282-595) mg.kg-1. Pedogenic distribution of iron oxides appeared depression with soil depth in soil great groups pedons of Durargids, Paleargids, Calciorthents and Xerochrepts_0.06 slope and an increase with depth in Xerochrepts pedon_0.03 slope. For extractable DCB iron oxides, soil great groups Paeargids and Xerochrepts appeared an increase with depth. In contrary, Durargids and Calciorthents appeared depression with depth. Also results referred for in common effect on pedogenic distribution of colorimetric extractable predicted iron oxides as clay 22,9% , CEC 23.4%, organic matter 6.97%, HCO3-1 4.6%, sand 4.0% , Mg+2 3.3%, while in common effect of clay 26,6% , CEC 27.6% , Ca+2 6.3% , K+ 1.7% , Na+ 2.9% , HCO3-1 7.8% , SO4-2 11.2% on DCB extractable predicted iron oxides. Using stepwise multiple linear regression model showed a high significant correlation between mean soil depth and its iron oxides contents as (r = 0.88) for Bashika-2 and (r = 0.93) for Hamdania-2 pedons for prediction Fe oxides_colorimetric,. while extractable iron oxides was reduced by slope increase with correlation coefficient (r =0.83) , (r =0.75) for both extraction methods respectively. | ||
| Keywords | ||
| pedogenic distribution of free iron oxides; colorimetric method; DCB method; DCB | ||
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