Root is the most directly exposed to the allelopathic conditions and therefore, it is likely to have significant more negative impacts in root than the above ground plant parts. Germination percentage, plant height, root length, above ground and root dry weights of A. nobilis in soil(greenhouse condition) were reduced significantly with increasing plant material levels of P. harmala, as they reduced significantly in treatments of 2 and 20%concentrations compared to their controls(1,2,4,) Root treatment with 2% level imposed more significant reduction in germination, root length, above ground and root dry weights of A. nobilis compared to above ground biomass with similar level in soil.

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