Evaluation of Chemical Soil Fertility under Different Land?Use Types in the Territory of Aru (Ituri, Democratic Republic of the Congo)
Keywords:
Chemical fertility, land use, tobacco cultivation, pH, exchangeable bases, CEC, Aru, DRCAbstract
This study assesses the chemical fertility of soils in the Territory of Aru (Ituri Province, DRC) under four land?use types, including tobacco cultivation (Nicotiana tabacum). Soil samples collected at depths of 0-30 cm were analyzed to determine pH (water and KCl), exchangeable bases (Ca²?, Mg²?, K?, Na?), and cation exchange capacity (CEC). The results indicate that the soils are generally slightly to moderately acidic, with no significant differences among land?use types. Magnesium dominates the exchangeable bases, and the sum of bases remains globally satisfactory. However, CEC values are low (1.57-3.34 cmol(+)/kg), revealing limited nutrient retention capacity. The impact of tobacco cultivation appears moderate in the short term, but the low CEC and observed acidity indicate fragile soil fertility. Integrated management combining organic and mineral inputs is recommended to ensure the sustainability of local agricultural systems.
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