Overview

The intensification of farming practices over the past few decades has raised many questions about changes in soil fertility. Cereal monoculture and intensive tillage have led to a decrease in soil organic matter, followed by a reduction in mineralization capacity. The use of bioresources (crop residues, farm manure, etc.) as soil amendments is becoming a necessary bioremediation technique for degraded soils. The objective of this study was to determine the impact of the quality of crop residues and manure on carbon and nitrogen mineralization and on changes in the chemical characteristics of two soil types in the arid regions of Tunisia. Rapeseed exhibited the highest CO₂ emissions, followed by durum wheat, while field beans and sulla exhibited the lowest values. Regarding cattle manure, it released CO2 very slowly in both sandy and clay soils. Furthermore, overall, cattle manure and legumes (Sulla Bikra 21 and field beans) exhibited the highest levels of nitrogen, cation exchange capacity (CEC), soluble organic matter (SOM), and total soluble organic matter (TSOM) (P

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