Author(s): P. Chakraborti and J. Mandal

Abstract: The study on allelopathic action of Rauwalfia tetraphylla L. root extracts recorded the seedling behaviour of French bean (Phaseolus vulgaris L.) with special emphasis on young roots. A sequence of aqueous root extracts (200, 150, 100, 50, 25 and 12.5 mg ml-1) were applied to analyse the initial effect of root growth and seedling, obligatory to establish a healthy plant. Various seedling parameters and critical analysis on deviating of root system specified the active allelopathic effect. Medium concentration (100 mg ml-1) of root extracts stirred the total root length, surface area that may be supportive for supplementary absorption of mineral nutrients and water from soil to establish the healthy seedling. In present experiment, it may be authenticated by the appearance of shoot length, vigour index of the seedling. Therefore, allelopathy can be incorporated as seed treatment tool for seed invigoration under seed/crop production programme.

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