Professional Evaluation of Soil Conservation Practices in the Gully-Prone Communities of Imo State, South East Nigeria

This study professionally evaluates the effectiveness of soil conservation practices implemented across gully-prone communities in Imo State, located in Nigeria's South East geopolitical zone. Gully erosion in Imo State is a persistent and deepening crisis, and despite government and donor investments in rehabilitation, independent professional evaluation of practice effectiveness is limited. Using a professional evaluation design, 25 gully rehabilitation sites in Owerri, Orlu, and Okigwe zones were assessed. Sites ranged in rehabilitation age from 1 to 10 years. Evaluation criteria included gully head recession rate (measured from multi-date satellite imagery), soil cover restoration, organic carbon recovery, runoff reduction, and community land use re-establishment. Effectiveness ratings were assigned using a structured scoring matrix. Key informant interviews with state Ministry of Environment engineers, community leaders, and World Bank project staff supplemented the technical assessment. Findings revealed that vegetation-based gully stabilisation using Vetiver grass, Tithonia, and Cajanus cajan achieved superior long-term effectiveness compared to civil engineering-only gabion and check-dam approaches, with 84 percent of vegetated sites showing gully head stabilisation after three years compared to 52 percent of civil engineering sites. However, combined approaches integrating engineering and vegetation achieved the highest success rates (91%). Community involvement in maintenance was the strongest predictor of long-term site stability. The study recommends prioritisation of combined biophysical approaches in future Imo State gully rehabilitation contracts, with mandatory community maintenance agreements. Keywords: gully erosion, soil conservation, Imo State, Vetiver grass, rehabilitation evaluation.