The aim of this work is to highlight the physico-chemical characteristics of the soils of the El Hadjar plain, wilaya of Annaba (north-east Algeria), and the evolution and dynamics of exist in gorganic matter. In order to know the soil properties of the El Hadjar-Annaba plain, we basedon a systematic sampling plan. The physico-chemical parameters analysed made it possible to define the soil characteristics, namely the pH which is slightly alkaline with a clay-silty texture, the electrical conductivity which is moderate and a limestone level which means that the soils in our study area are moderately calcareous. The results of the fractionation of the organic matter highlight the fragile aspect of the rapid mineralization of this organic matter with the absence of poly condensation products with a low degree of relative polymerization. This situation suggests strict control of organic matter inputs to soils in this region.

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