“…Organic matter in topsoil is often scarce in the Mediterranean region, especially in agricultural areas; the analyses carried out during revegetation works showed values of 1-3%. Topsoil did not contribute nutritionally to plant growth, but improves soil properties and water relations, favouring the survival and growth of sown species, and allowing a greater vegetation cover in a shorter time, although higher thickness does not improve plant cover or richness (Cotts et al, 1991;Jiménez et al, 2013;Mola et al, 2011;Magro et al, 2014;Rivera et al, 2014). Another advantage of topsoil is to store seeds of local plants, most of them not commercialised, reinforcing hydroseedings; the enrichment in species obtained in our results seems to be favoured by the use of topsoil in the slopes.…”