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International Journal of Soil Science
  Year: 2013 | Volume: 8 | Issue: 2 | Page No.: 32-46
DOI: 10.3923/ijss.2013.32.46
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Characterization and Classification of River Benue Floodplain Soils in Bassa Local Government Area of Kogi State, Nigeria

A.U. Akpan-Idiok, M.E. Ukabiala and O.S. Amhakhian

The floodplain soils occupy about 1,179,400 ha along the river Benue and are useful for agricultural production, but their agricultural potentials have not been scientifically evaluated. Soil characterization was carried out to determine the morphological, physicochemical and mineralogical characteristics of river Benue floodplain soils in Bassa, Kogi State, Nigeria. Three physiographic units were identified and designated as Bassa Loamy Soils (BLS), Bassa Cleyey Soils (BCS) and Bassa Sandy Soils (BSS). Seven profiles were excavated with three in BCS, two each in BLS and BSS units. The soils were characterized as follows: Hues of 10YR-2.5YR, low chroma (≤2), high value mottles (≥4), high contents of clay (>400 g kg-1) in BCS, sand (>900.0 g kg-1) in BSS, strongly to slightly soil reaction (pH 5.5-6.3), low organic carbon (0.3-14.3 g kg-1), low available P (3-8 mg kg-1), high effective cation exchange capacity (ECEC) (6.54-22.2 cmol kg-1), base saturation (90-99%) and low mineral contents (<40%) for quartz, kaolinite and illite in silt-clay fraction of BLS and BCS soil units. The pedogenic process was "gleization" in the soils. The USDA Soil Taxonomy classified the BLS and BCS units as Fluventic Ustropepts, Loamy, Mixed, Isohyperthermic and Vertic-Fluventic Ustropepts, Clayey, Mixed Isohyperthermic, respectively while BSS fitted Oxyaquic Quartzipsamment at the subgroup level. Equivalent FAO-UNESCO units were Eutric Fluvisols for BLS, Vertic Cambisols for BCS and Arenic Fluvisols for BSS. The BCS unit was rated high in fertility status and fine-textured materials than the BLS and BSS units.
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How to cite this article:

A.U. Akpan-Idiok, M.E. Ukabiala and O.S. Amhakhian, 2013. Characterization and Classification of River Benue Floodplain Soils in Bassa Local Government Area of Kogi State, Nigeria. International Journal of Soil Science, 8: 32-46.

DOI: 10.3923/ijss.2013.32.46






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