Abstract
A study is described in which two very low levels of fertilizer application and three levels of rabbit grazing treatments were used to accelerate the colonization of a limestone quarry floor from an initial mean vegetation cover of 21-4%. A factorial experiment was laid out with six randomized blocks, each with six plots. An «extra-fertilizer» treatment was added later by splitting the plots. All treatment combinations were studied over 5 years for their effects upon the percentage cover of vegetation, species richness, species frequency and the number of species in flower. There was virtually no change in mean percentage cover values in the control plots (no fertilizer, unrestricted grazing), but all the other treatments produced some increase (...)
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