The soil represents the large reservoir of carbon biomass of the continental biosphere containing approximately twice the stock of atmospheric carbon; However, knowledge of its stock on agricultural soil is necessary to quantify its agricultural fertility in its relationship to nitrogen. Thus, a few indicators were verified, in particular agricultural practice (incineration and non-incineration), hydrogen potential (pH), total organic matter, total carbon content of surface horizons for slices of 0-10 Cm, 10 -20Cm, 20-30Cm. The following results were obtained :The global average of earthworms in the intertropical zone is 25 individuals per square meter (25U/m² ) while the use of the practice of incineration annihilates this population for the slice of the soil of 0-10 cm depth; The hydrogen potential (pH) shows an overall average of 4.04 which ranks it among the very acidic soils of the region. This acidity is due to the agricultural practice which removes the vegetation cover, and nature of the source rock but also to the excess of precipitation. Total organic matter is found in an average of 17.17 percent in the soils of Haut-Uélé while the total organic carbon rate is on average 9 percent. Following the effects of climatic conditions (rainfall, temperature, etc.) in the Uélé Basin, the organic part of this ferralsols tends to be lost in erosions (internal and external)

Organic, Carbon, Fertility

agronomy

Presentation: poster