Abstract: Field restoration experiences of some eroded areas in the Pyrenean mountains showed the importance of substrate nutrient enrichment through chemical fertilization. A greenhouse experience using regolithic materials from the badlands of the High Llobregat basin (Catalunya, NE Spain) was con-ducted to study the influence of the kind of nutrient added and the fertilizer rate on plant used in their revegetation. The fertilizer doses were: 1(the normal amount for the crops of the area: 64 kg N ha-1, 120 kg P2O5 ha-1 and 120 kg K2O ha-1), 0.5, 1.5 and 2 fold. The results demonstrate that phosphorus is the nutrient that limits the chemical fertility of this substrate longer, because the addition of this element increases the production two-fold, whereas the material supplies sufficient potassium. Maximum plant production is found when NPK and NP fertilizers are used, especially when the rate is 1.5. With this dose the success of the field revegetation is achieved.
Key words: Badlands, Reclamation, Chemical fertilization, Regolith.