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Assessment and classification of agricultural surface soil in the Sudan Savannah, Kebbi State Nigeria was carried out from 2008 to 2011 using a modified version of Jenny's equation of soil forming factors. A comprehensive account of major classes of surface soil characteristics was given. The following surface soil components have been covered: temperature and moisture characteristics, topography, parent materials, organisms and land properties. Consequently, the physical agricultural surface soil conditions in five local government areas of the State: Arewa, Argungu, Augie, Birnin-Kebbi and Dandi are characterised by six major surface moisture characteristics: aquic, aridic, torric, udic, ustic and perudic; 10 topographical classes: back- slope, bendy, concave, contour, convex, deeply,flatly, linear-flat and shallow; three major soil biota: ants, earthworms and termites; andseven land characteristics: bad-lands, blown-out-lands, cirque-lands, fertile- lands, gulliedlands, miscellaneous and rock-outcrops. The major parent materials are alluvial, colluvial,fluvial and lacustrine. Physically, these parent materials are describe according to theirphysical appearance into fadama clay soils, fadama clay-loam soils, dryland sandy soils,dryland sandy-loam soils, dryland stony soils, and organic-mineral soils. Generally, the studyhas provided a better understanding of the current status of the major physical components ofagricultural soils and overall natural environment for future agricultural economic management in the region.

Improvements in geophysical surface soil assessment and classification using modifying Jenny’s equation of soil forming factors in the Sudan Savannah