Forms And Contents Of Iron And Aluminum In Inland Flood Plains Of South-Eastern Nigeria

Fourteen representative soils from inland flood plains in Southeastern Nigeria were studied to characterise forms (crystalline and amorphous) contents in iron and aluminium oxides. Total iron and aluminium, extracted using HCI after fusion with Na2CO3, ranged from 1.25 to 7.74% by weight of dry soil, with a mean of 3.29% for total Fe2O3 and from 9.75 to 44.67% with a mean of 26.04% for total Al2O3. Broad textural grouping of the soils showed mean total contents of Fe2O3 and Al2O3 comparable to fine-textural soil, medium-textured soil, and coarse-textured soil. On the basis of drainage, mean contents of total iron and aluminum are, in a decreasing order: very poorly drained, poorly drained and imperfectly drained soil. Total free oxides (DCB extractable forms) averaged 0.59 and 0.16%, for DCB Fe2O3 and DCB Al2O3, respectively. The fine texture soil gave the highest mean value (0.90%) for DCB Fe2O3, as compared to medium and coarse texture soils. Generally, values of oxalate extractable and pyrophosphate extractable Fe2O3 were relatively low. The reactivity of the sesquioxides, measured using the ratio of oxalate extractable-to dithionite extractable iron and aluminum, tended to be high, indicating that much of the total free oxides exists mainly in the form of amorphous oxides and, which, impeded drainage. Active ratios of Al2O3 were generally higher than those of Fe2O3. The extractability of total free iron ranged from 8.50 to 25.3% while that of aluminum ranged from 0.26 to 1.84%, suggesting a relatively less weathering of these inland plain soils (Wetland soils).

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Author TO Ibia
Maintainer Agronomie africaine
Version 2005
Last Updated April 2, 2024, 14:19 (UTC)
Created April 2, 2024, 14:18 (UTC)
Issue 3
Pages 211-218
Volume 17