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This study was conducted to evaluate the allelopathic effects of aqueous extractsfrom different vegetative parts (root, stem, and leaf) of the invasive exotic speciesNicotiana glauca on seedling growth of a native species Juniperus procera. Twoconcentrations of 5g/l and 20 g/l were employed in the treatment. Stem extracts of bothconcentrations increased the seedlings' mortality over 88%. Extracts had a negative effecton root dry weight (P=0.015) and root to shoot ratio (P=0.004). Root and leaf extractsshowed different effects on seedling growth parameters such as total root length, rootsurface area, root volume, number of root tips, root dry weight, shoot dry weight, and rootto shoot ratio . Leaf extract promoted growth with increasing concentration, while rootextract deterred growth parameters

Effect of aqueous extract of the invasive species Tobacco (Nicotiana glauca L.) on seedlings growth of Juniper (Juniperus procera L.)