Reference soil Nigeria 07: Ferric Luvisol

NG007

Distribution of Luvisols (rough estimation supplied by soilgrids)

Reference soil NG007: Ferric Luvisols

Location: West of road to meteorological station block 33. Physiographic unit: Upper part across a wide valley, gently undulating, a local weakly pronounced rise. Watertable in B21t during peak of rainy season. Parent material: Sandy colluvium, over clayey sediments of Tertiary or secondary age; containing a few rounded weathered iron-sandstones at 50-75 cm. Drainage: Well drained, mottles in subsoil are probably inherited. Human influence: Surface soil shows the effect of deep mechanized ploughing whereby the subsoil was mixed with the A horizon and is visible as lighter coloured patches. INRA classification: Sol ferralitique faiblement desature apprauvi hydromorphe. Additional notes on profile description: Ap: few faunal voids; charcoal fragments; locally mixing with underlying horizon. A2: Fine roots diminishing with depth. B21t:Reddish mottles increasing with depth; slight clay-humus infiltration along vertical ped surfaces, with a chroma of 1 lower than matrix; some faunal voids. Ikenne toposequence, profile no. 069. Profile forms part of IITA-LRD-ISM program. Brief description of the soil: Deep reddish profile with brownish sandy surface layers and strongly mottled, lighter textured subsoil. Oxic is a tentative subgroup (USDA). References: Forbes, T.R.: A West African soil climosequence and some aspects of foodcrop potential. A thesis for the Degree of Master of Science. Cornell University, August 1975. Murdoch, G.; Moormann, F.R.: Identification of soil toposequences in the humid tropics of West Africa. Miscellaneous report 178, Foreign and Commonwealth Office - Overseas Development Administration. Surbiton, Surrey, England 1974. Ola, S.A.: Tropical soils of Nigeria in engineering practice, University of Benin, Benin City. Rotterdam 1983. Smyth, A.J.; Montgomery, A.F.: Soils and land use in Central Western Nigeria. Ministry of Agriculture and Natural Resources. Ibadan 1962. Vine, H.: Review of work on Nigerian soils. Report to the National Research Council, Committee on tropical soils. University of Leicester, England June 1970.

Profile description

Ap 0-15 cm	very dark greyish brown (10YR 3/2, moist)sandy loam,weak fine crumb,very friable,many fine pores and many tubular pores,few channels,clear wavy boundary to,
E 15-55 cm	pale brown (10YR 6/3, dry) (dark) brown (10YR 4/3, moist)sandy loam,weak fine subangular blocky and ME fine subangular blocky,very friable,faint mottles,many fine inped tubular random pores and common inped tubular random pores,clear smooth boundary to,
Bt 55-90 cm	light reddish brown (5YR 6/3, moist)sandy clay loam,moderate fine subangular blocky,very hard firm,common fine faint mottles and few fine distinct mottles,broken thin unspecified on horizontal and vertical pedfaces cutans,many fine inped tubular pores and common inped tubular pores,few channels,gradual smooth boundary to,

Mode of accumulation or deposition of parent material	colluvial
Mode of accumulation or deposition of parent material (second entry)	residual material
Remarks on Parent Materials	over clayey sediment
Texture of parent material	sandy clay
Texture of parent material (second entry)	loamy
General characterization of the status of weathering of solid rock	highly
General characterization of the status of weathering of solid rock (second entry)	highly

Land improvements ; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	land clearing
Land use or vegetation in the immediate vicinity of the site	fallow
Remarks on Land Use / Vegetation	Eupatorium odoratum after clearing
Status of vegetation; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	secondary
Major vegetation type; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	grassland

Altitude	29m
Physiographic Unit	see remarks
Physiographic position of the site	upper slope
Regional landform; McDonald, R.C., Isbell, R.F. et all, 1984; Australian soil and land survey Field Handbook, Inkata Press, Melbourne.	low hill
Slope	0%
Slope Aspect	west
Form of the slope surrounding the site	straight
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	flat or almost flat

Flooding frequency (FAO, 1986)	never
Kind of ground water table (USDA, 1979)	no groundwater table observed
Moist From - To	0-90cm
Estimated permeability (class) of least permeable part of the profile	slow

You are here

Reference soil Nigeria 07: Ferric Luvisol

Reference soil NG007: Ferric Luvisols

Classification