摘要
Land degradation is the critical ecological and agricultural challenges in Ethiopia. To combat this, the government and local farmers' have undertaken soil and water conservation measures (physical, biolo-gical and integrated) across the country since 1970's. This study investigate effect of elephant grass (P. purpureum) and sesbania sesban (S. sesban) used as biological land rehabilitation practices on soil properties and farmers' perception on the practices. Composite soil samples (0–30 cm) were randomly collected from lands treated with sesbania, elephant grass, and adjacent degraded grazing land, and a structured questionnaire was used to assess farmers' perceptions. Statistical results showed that elephant grass and sesbania were significantly (P < .05) improves degraded land soil bulk density, pH, CEC, OC, TN, Av.P, K, Na, Ca, Mg and clay characteristics. Moreover, there was a significant (P < .05) difference between farmers' perception of the effectiveness of physical, biological and integration of the two practices to control soil erosion. 48% of the farmers perceived that using both biological methods and the integration of biological with physical structures was more successful for controlling erosion and im-proving soil fertility. Logistic regression analysis revealed strong association (R2 = 0.84) between farmers' perception on elephant grass and sesbanias' roles in soil conservation and groups of explanatory variables. Among the variables age, education and extension service significantly (P < .05) influenced farmers' perception on the practices. Generally, elephant grass and sesbania are effective biological practices for rehabilitating lands and improving soil properties through minimizing erosion.
