Nigeria Geographical Journal, Volume 9(1) June 2013: ISSN 1358-4319 ©Association of Nigerian Geographers; All Rights Reserved ____________________111 ASSESSMENT OF SOIL STRUCTURAL STABILITY UNDER DIFFERENT VEGETAL COVER CONDITIONS IN THE FEDERAL CAPITAL TERRITORY, ABUJA, NIGERIA J.A. Edicha and L.L.O. Mgbanyi Department of Geography and Environmental Management, University of Abuja, P.M.B 117 Abuja, Federal Capital Territory, NIGERIA *Correspondence (libertwise@yahoo.com) ABSTRACT The study examined Soil Structural Stability under Different Vegetal Cover Conditions in the Federal Capital Territory (F.C.T), Nigeria. The study relies essentially on Pieri’s (1991) Critical Level of Soil Organic Matter Concentration (St) used to assess structural stability and susceptibility of the soil to erosion. Some of the land use considered were Riparian vegetation, Primary forest, Continuous farming, Continuous cropping, Flood plain, Sugarcane plantation, Grassland, Secondary forest and Rural land use. On a transect line of 100 metres, a quadrant of 60cm by 60cm was located at every 50 metres. nine (9) equal size grids up to three (3) parts and the midpoint of it on each land use was sampled during dry season and wet season using soil auger for analysed in the laboratory using standard Analytical Procedures (Jou, 1983);Organic carbon by wet digestion method(Walkley and Black ,1934), Soil particle size distribution by Bouyoucos (1951) hydrometer method. The result shows that soils under all the land use have St≤5%; indicating loss of soil structure and high susceptibility to erosion both in the wet and dry season with most of the land uses experiencing more of this phenomenon in the wet season. S t across the land uses in the wet season is 2.36% and in the dry season 3.33%%.The study recommend sugarcane plantation in stabilizing soil structure and reducing soil erosions in the floodplain areas care for soils on all land use during wet season as this could exacerbate soil tendency to erode by water in the study area. Keywords: Critical level; Organic matter; Landuses; Structural stability; Erosion susceptibility; Vegetal Cover INTRODUCTION Human activities such as agriculture and urbanization are capable of interfering and affecting the normal operability(Mallo and Mgbanyi, 2013) of the biological processes of aggregation, the most prominent being: the burrowing and moulding activities of soil animals, the enmeshment of