The use of natural resources and the need of recovering degraded areas have reached global importance. For that, estimating costs is an important tool to make the implantation of conservation and recovery projects economically feasible. So, costs for the implantation of one hectare of Astonium fraxinifolium Schott, with green fertilizer, in a degraded typical Hapludox soil, were estimated, as it follows: Astronium fraxinifolium + Canavalia ensiformis; Astronium fraxinifolium + Crotalaria juncea; Astronium fraxinifolium + NPK (04-14-08); and Astronium fraxinifolium + Brachiaria decumbens + sewage sludge. The estimated cost for the implantation of Astronium fraxinifolium in the eastern region of the Mato Grosso do Sul State, Brazil, ranged from R$ 2,829.13 to R$ 3,872.21. The Brachiaria decumbens + sewage sludge treatment was the most economic one, when we consider a five-years period and the environmental benefits related to the viable disposal of this kind of residue by sewage treatment plants.
Recovery of degraded areas; environmental impact; biosolid
