Allelopathic potentialities of two ornamental plants murraya paniculata (l.) Jack and alamanda cathartica l. On germination and growth behaviour Of four selected crops

An experiment was conducted to understand the growth inhibitory effects of aqueous extracts obtain from Murraya paniculata (L.) Jack and Alamanda cathartica L. (Ornamental plants) on four agricultural crops of Tripura, India. The test was conducted in sterilized Petri dishes with a photoperiod of 24 hours and an average temperature of 22±2°C. The effect of different concentrations of both the leaf extracts were recorded and compared with control (i.e., distil water). Result showed different concentrations of aqueous leaf extracts caused inhibitory effect on germination, root &shoot elongation and dry biomass of receptor crops. Bioassays also indicated that the inhibitory effect was proportional to the concentrations of the extracts and higher concentration had the stronger inhibitory effect in both the species. These kinds of concentrations dependent response of the receptor plants suggested that the leaf extracts of the both species might contain allelochemical(s).