Abstract
This paper reports the effects of applying 0 and 40 Mg ha(-1) of biosolids (composted sewage sludge) on the revegetation of abandoned cropland in central Spain. The experimental vegetation consisted of four wild leguminous species: Colutea arborescens, Dorycnium pentaphyllum, Medicago strasseri and Retama sphaerocarpa. The survival and growth of these shrubs were evaluated over 24 months after planting, as was the production of biomass by the spontaneous herbaceous vegetation. Application of the biosolids increased shrub growth, although it was also associated with a slight reduction in shrub survival. The spontaneous vegetation became quickly established in the amended plots; its biomass production was significantly greater than in the control plots.
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