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The first meter of deep and developed ferrallitic soils of West-Central Cote d’Ivoire is studied under the two very distinct types of vegetation, the high-slope in an initial state of soil and the bottom-slope on farming plots, which are overlapping in the region. The study mostly concerns the A and B horizons which are thus characterized and compared. Compared to high-slope soils, bottom-slope soils that did not exhibit a sharp textural gradient showed a marked decrease of quartz pebbles and ferruginous or inanganoferric gravels content in the whole profiles. The soils of bottom-slope are deeper and have a good structure with more clay. This is essentially a function of the conditions of humidity and in which they form and evolve, and which intensify the processes of alteration. For the same reason they are generally made up of products of this alteration by particularly resistant minerals, which are, however, already more or less degraded, mainly quartz, and, more rarely, white mica. The microaggregated horizons, characteristic of bottom-slope soils, have a good pore size distribution. Water infiltrates in these horizons through a network of fine interconnected fissures which define microaggregates. Soils properties and soil formation are affected by the topography.

agriculture and biology journal of north america

Study on comparative plots of the evolution of the first meter of deep ferrailitic soils under the influence of different types of marginal forest areas of the Côte d’Ivoire