Wind Erodibility of Soils From Khartoum State

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M.A., Mustafa
Medani, G.H.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
Wind erodibility of soils (WE) is a prime factor for the prediction, assessment and mapping of wind erosion. Hence, this study was undertaken to generate WE data and pertinent relationships for Khartoum State. Surface soil samples (0-3 cm) were collected from fifty farms scattered all over the state and non-erodible soil particles (NEP) (>0.84 mm in diameter), WE and various relevant physical and chemical soil properties were determined. Regression analysis showed that NEP significantly (P<0.01) increased with increase in clay (r2=0.600), CaCO3 (r2=0.376), silt (r2=0.302) and organic matter (r2=0.175), and decreased with increase in sand (r2=0.423), (silt+ sand) / clay (r2= 0.583), (silt+ sand)/ (clay+organic matter (r2=0.544), and (silt +sand) / (clay+ CaCO3) (r2=0.595). The four basic soil properties and their ratios gave the reverse effects on WE with slightly lower or higher coefficients of determination. The (silt + sand) / (clay + CaCO3) ratio is recommended as an index of both NEP and WE, because it integrates the three resilient primary soil particles and the slightly soluble CaCO3 salt previously recommended as a differentia of the wind erodibility groups. Multiple regression equations were derived for the prediction of NEP (r2= 0.630) and WE (r2=0.631) from knowledge of the four soil properties. It is recommended to predict NEP and look up WE from a standard table. These properties accounted for 63% of the variability of the two parameters. The determined NEP of the wind erodibility groups correlated very well with those established in other countries
Page(s): 11 (2), 149-164, 22 Ref.