In the semiarid central Ebro valley, the soils of the badlands surrounding Zaragoza city exhibit severe degradation features. Nevertheless, poor land management practices and limiting climatic and edaphic factors make the natural regeneration of the soil difficult. The use of sewage sludge as amendment for land rehabilitation is increasingly being considered as a technical solution to reverse this environmental degradation and to restore the original vegetation cover. This paper describes the changes produced on the natural vegetation cover after application of digested sewage sludge (biosolids) to three soil types. Experiments were conducted on plots with two different slope levels by applying different rates of biosolids. When increasing rates of biosolids were applied, the biomass yield increased proportionally, although differences among the different soil types and the level of the slope were observed. To avoid undesirable side-effects, mainly referred to soil pollution (salinity and toxic levels of metals), each case has to bf: individually studied. Therefore, prior to application both characterisation of biosolids and determination of the most suitable application rates to be used are required.