Laboratory experiments were conducted to evaluate the allelopathic effects of different concentrations (5, 10, 20, 30, 40, 50%) of Calotropis procera (Aiton) W.T. leaf aqueous extract, using different indices for germination, seedling and physical growth of wheat (Triticum aestivum) and Black mustard (Brassica nigra). Except for germination speed, results indicated that the extracts have such allelopathic potential which can significantly reduce the total germination percentage, germination

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... x, seedling vigor and certain growth parameters like shoot and root length and leaf area of the two tested plants. The rate of inhibition is concentration dependent. The present results mirror what happens under field conditions, where bare patches of neighbouring plants with different sizes or poor regeneration around C. proceara was observed.