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Erodibility in relation to water-dispersible clay for some soils of eastern Nigeria

✍ Scribed by C. A. Igwe


Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
93 KB
Volume
16
Category
Article
ISSN
1085-3278

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✦ Synopsis


Water dispersible clay (WDC) can influence soil erosion by water. Therefore, in highly erodible soils such as the ones in eastern Nigeria, there is a need to monitor the clay dispersion characteristics to direct and modify soil conservation strategies. Twentyfive soil samples (0-20 cm in depth) varying in texture, chemical properties and mineralogy were collected from various locations in central eastern Nigeria. The objective was to determine the WDC of the soils and relate this to selected soil physical and chemical attributes. The soils were analysed for their total clay (TC), water-dispersible clay (WDC), clay dispersion ratio (CDR), dispersion ratio (DR), dithionite extractable iron (Fed), soil organic matter (SOM), exchangeable cations, exhangeable sodium percentage (ESP) and sodium adsorption ratio (SAR). Total clay contents of the soil varied from 80-560 g kg Γ€1 . The USLE erodibility K ranges from 0Á02 to 0Á1 Mg h MJ Γ€1 mm and WEPP K fall between 1Á2 Γ‚ 10 Γ€6 -1Á7 Γ‚ 10 Γ€6 kg s m Γ€4 . The RUSLE erodibility K correlated significantly with CDR and DR (r ΒΌ 0Á44; 0Á39). Also, a positive significant correlation (r ΒΌ 0Á71) existed between WEPP K and RUSLE K. Soils with high clay dispersion ratio (CDR) are highly erodibile and positively correlates (p < 0Á51) with Fed, CEC and SOM. Also, DR positively correlates with Mg 2ΓΎ and SOM and negatively correlate with ESP and SAR. Principal component analysis showed that SAR, Na ΓΎ and percent base saturation play significant role in the clay dispersion of these soils. The implication of this result is that these elements may pose potential problem to these soils if not properly managed.


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