Abstract
ABSTRACT Seed germination ability of 20 wild Trifolium taxa from the Iberian Peninsula was studied at a 20°C and a relative humidity of 40–60%. A high degree of hardseededness was observed, because the germination percentages obtained were lower than 10%, (except for T. pratense, lower than 40%), both under cool white light and in the dark. Sulphuric acid was identified as an effective dormancy breaking agent. Scarification by immersion in sulphuric acid for different lengths of time was tested under different light conditions. Vigour values were calculated and cumulative germination curves were made to illustrate the kinetics and different germination speeds of species and treatments.
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